A phoneme inventory catalogues all contrastive sounds in a language, identified through minimal pair testing. Sounds are phonemes if substituting one for another changes meaning. Inventories vary dramatically across languages, from as few as 11 phonemes to over 140, revealing patterns about which distinctions are practically useful.
Practice identifying minimal pairs in transcribed data, then construct a phoneme inventory by distributing allophones into phonemic categories. Analyze multiple languages to see variation.
A language's phoneme inventory is its roster of contrastive sounds — the sounds whose substitution changes word meaning. Building that inventory requires a methodical procedure, and the core tool is the minimal pair: two words that differ in exactly one sound and have different meanings. "Bat" and "pat" in English differ only in the first consonant (/b/ vs /p/), and they mean different things, so /b/ and /p/ are distinct phonemes. If swapping a sound never changes meaning in any word in the language, those sounds are not separate phonemes — they are allophones of the same phoneme, surface variants whose distribution is predictable.
The distinction between phones and phonemes is foundational. A phone is any physically distinct sound a speaker produces. A phoneme is an abstract category that groups phones together when native speakers treat them as "the same sound" for the purposes of meaning. English speakers produce two physically distinct variants of /p/: a strongly aspirated [pʰ] at the start of words ("pin") and an unaspirated [p] after /s/ ("spin"). These are different phones — you can hear the puff of air. But no English word changes meaning when you swap them, so they are both allophones of the single phoneme /p/. Korean speakers, by contrast, have aspirated and unaspirated stops as separate phonemes: minimal pairs exist that distinguish them. Same physical sounds, different phonemic status — because phonemic status is defined by the language, not by physics.
Conducting an inventory analysis requires you to work through transcribed data systematically. You collect all the contrasts you can find via minimal pairs, group sounds that only appear in complementary environments (i.e., they never appear in the same context) into single phonemes, and build a table. The result reveals the contrastive structure of the language — which distinctions that language "cares about" and which it does not. This varies dramatically: Hawaiian has 13 phonemes; some Caucasian languages have over 80 consonants. The inventory reflects what sound distinctions the language uses to build its vocabulary.
Phoneme inventory analysis is the prerequisite skill for nearly all subsequent phonological work. When you write phonological rules, you write them over phonemes and features. When you describe allophonic distribution, you describe how the phoneme's allophones are conditioned by context. The inventory gives you the vocabulary of the phonological system; the rules tell you its grammar.
This is a foundational topic with no prerequisites.
No prerequisites — this is a starting point.