What term do anthropologists use to refer to small units of sounds that can make a critical difference in meaning within a language, but do not have any meaning on their own?

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Anthropologists use the term "phonemes" to refer to small units of sounds that can make a critical difference in meaning within a language, but do not have any meaning on their own. Morphemes refer to the smallest units of meaning in a language, while paralanguage refers to nonverbal aspects of communication such as tone of voice and body language. Grammar refers to the set of rules governing the structure of a language.

What Term Do Anthropologists Use to Refer to Small Units