English Sonorants: Nasals and Approximants | Phonetics Guide

The vocal tract contains fixed upper structures (hard palate, upper teeth) serving as passive articulators and movable lower structures (tongue, jaw, lower lip) serving as active articulators. The jaw moves to bring active and passive articulators into contact. Specific adjectives identify articulatory positions: bilabial (both lips), labiodental (lower lip and upper teeth), dental (teeth), alveolar (alveolar ridge), palatal (hard palate), velar (soft palate/velum), uvular (uvula), pharyngeal (pharyngeal wall), and glottal (space between vocal folds). Alveolar sounds like [t] and [d] share the same place (alveolar ridge) but differ in voicing. Glottal sounds occur when vocal folds push against each other in the glottis, producing unique sounds like [h] and [ɡ]. This systematic approach enables precise classification of all consonant sounds across languages.

English consonant sounds are produced at specific locations in the vocal tract called places of articulation, where active articulators (like the tongue) move toward passive articulators (like the alveolar ridge or palate). The main places include bilabial (both lips, e.g., /b/, /p/), labiodental (lower lip against upper teeth, e.g., /f/, /v/), dental/interdental (tongue between teeth, e.g., /θ/, /ð/), alveolar (tongue tip at alveolar ridge, e.g., /t/, /d/, /n/, /s/, /z/, /l/), post-alveolar/retroflex (tongue curved back behind alveolar ridge, e.g., /r/, /ʃ/, /ʧ/), palatal (middle tongue to hard palate, e.g., /j/), velar (back tongue to soft palate, e.g., /k/, /g/, /ŋ/), glottal (vocal cords, e.g., /h/, glottal stop), and labialized velar (rounded lips + velar approximation, e.g., /w/).

In speech production, articulators are divided into two types: active articulators (such as the lower lip, tongue, uvula, and glottis) that move from their position toward other articulators to shape sounds, and passive articulators (such as the upper lip, alveolar ridge, hard palate, and soft palate) that remain stationary and serve as targets for the active articulators to touch or approach.

Speech production involves active and passive articulators. Active articulators are body parts that move during speech, including the lips, tongue, and jaw. Passive articulators are stationary structures that the active articulators move against, including the teeth, alveolar ridge, hard palate, soft palate (velum), and uvula. Understanding the distinction between active and passive articulators is essential for analyzing how speech sounds are produced. The velum (soft palate) is particularly important as it controls whether air flows through the mouth or nose.

All consonants can be classified using three dimensions: Place of Articulation (where in the vocal tract the sound is made), Manner of Articulation (how air flows through the vocal tract), and Voicing (whether vocal folds vibrate). These three factors capture the vast majority of human speech sounds, though the IPA chart represents only a fraction of all possible sounds with additional diacritics needed for precision.

Any consonant can be completely described by three dimensions: voicing (vocal cords state), place of articulation (which articulator is involved), and manner of articulation (what the articulator is doing). Conventionally, these are specified in order: voicing, place, then manner. For example, English /z/ is a voiced alveolar fricative. Phones are distinct speech sounds, not letters—the English spelling system is insufficient because one symbol often represents multiple sounds (e.g., 'th' represents two different sounds). The International Phonetic Alphabet provides one symbol per sound. Manner of articulation includes stops (complete blockage followed by release), nasals (air redirected through nose), and fricatives (partial blockage creating continuous friction). Understanding these three dimensions enables systematic classification and description of all possible consonant sounds across languages.

The human vocal tract contains specialized speech organs: lips (upper and lower), teeth, hard palate (bony front roof behind upper teeth), soft palate (velum, fleshy back roof), and uvula. The tongue divides into tip, blade, front, back, and root sections. Two main cavities exist: oral (mouth) and nasal (nose), controlled by velum movement. Consonants are systematically classified using three criteria: Place of articulation (where sound is produced in the vocal tract), Manner of articulation (how the tract is constricted), and Voice (vocal cord vibration). This three-dimensional classification system allows linguists to categorize all consonant sounds across languages. For example, bilabial consonants involve both lips, dental involve teeth and tongue blade, alveolar involve tongue blade against alveolar ridge, palatal involve tongue front against hard palate, velar involve tongue back against soft palate, and uvular involve tongue back against uvula.

Consonants are classified according to three dimensions: place (location of constriction in the oral cavity), manner (degree or type of constriction), and voicing (presence or absence of vocal fold vibration). These three factors work together to produce different speech sounds.

Consonants are systematically classified using three interconnected dimensions: (1) Voicing (voiced vs. voiceless); (2) Place of articulation (bilabial, labiodental, dental, alveolar, palato-alveolar, palatal, velar, glottal); (3) Manner of articulation (stop, fricative, affricate, nasal, lateral approximant, retroflex approximant, glide). The standard descriptive convention follows this order: voicing status, place of articulation, manner of articulation. For example, /p/ is 'voiceless bilabial stop,' /m/ is 'voiced bilabial nasal,' and /r/ is 'voiced alveolar retroflex approximant.' This systematic framework enables precise identification and description of any consonant sound in any language.

In English phonology, sonorants (also called resonants) are sounds produced with continuous airflow without restriction, causing no air friction; they include all vowels, three nasals, two semi-vowels, and two liquids, and are always voiced. Obstruents are the opposite—they involve restricted airflow that creates air turbulence, and include plosives (stops like /p/, /b/), affricates (like /ʧ/, /ʤ/), and fricatives (like /f/, /s/); unlike sonorants, obstruants can be either voiced or unvoiced.

Obstruents and sonorants represent the two fundamental categories of speech sounds in phonology. Obstruents are produced by obstructing airflow and include stops (complete obstruction, like /p/), fricatives (turbulent airflow, like /s/), and affricates (stop-fricative combination, like /ʧ/). They are prototypically voiceless though voiced variants exist. Sonorants involve continuous airflow and include nasals, liquids, semi-vowels, and vowels. Sonorants are almost always voiced across languages. This classification forms the foundation for understanding syllable structure and sonority sequencing principles.

Obstruents are consonants produced by obstructing airflow (plosives, fricatives, affricates, lateral fricatives). Sonants are produced with continuous non-turbulent airflow (nasals, liquids, glides, vowels). As long as breath lasts, sonants can be pronounced indefinitely. This distinction is fundamental to understanding how languages categorize and organize their consonant inventories.

In phonetics, sounds are classified into obstruents (which involve obstruction of airflow, including stops) and sonorants (which allow free airflow without obstruction). Stops, a type of obstruent, are produced through three stages: the closing stage (where articulators come together to block airflow), the closure stage (where the blockage is maintained), and the releasing stage (where the blockage is released to produce the sound).

Consonants divide into sonorants (nasals, liquids, glides) and obstruents (stops, fricatives) based on whether they build oral cavity pressure. Sonorants allow continuous airflow; obstruents block or constrict it. English has both voiced and voiceless obstruents but only voiced sonorants. This classification explains multiple phenomena: English plurals avoid two stridents at word edges; adjective-to-verb conversion ('-en') applies only to obstruent-ending adjectives; Polish devoices final obstruents but not sonorants. Understanding these natural classes reveals why certain sound changes are productive while others are impossible.