Morpheme

In linguistics, a morpheme is the smallest language unit that carries a semantic interpretation. Morphemes are, generally, a distinctive collocation of phonemes (as the free form pin or the bound form -s of pins) having no smaller meaningful members.

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English example:

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The word "unbelievable" has three morphemes "un-", (negatory) a bound morpheme, "-believe-" a free morpheme, and "-able". "un-" is also a prefix, "-able" is a suffix. Both are affixes.

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Linguistics: Broadly conceived, linguistics is the scientific study of human language, and a linguist is someone who engages in this study. (Lay people sometimes use the term linguistician, but as Aitchison 2003 points out, this is "too much of a tongue-twister to become generally accepted.")...

Semantic: redirect semantics...

Collocation: Within the area of corpus linguistics, collocation is defined as a pair of words (the 'node' and the 'collocate') which co-occur more often than would be expected by chance....