morpheme vs language unit

morpheme and language unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
morpheme	Yes	No	No	No
language unit	Yes	No	No	No

As nouns, language unit is a hypernym of morpheme; that is, language unit is a word with a broader meaning than morpheme:

morpheme: minimal meaningful language unit; it cannot be divided into smaller meaningful units
language unit: one of the natural units into which linguistic messages can be analyzed

Other hypernyms of morpheme include linguistic unit.

morpheme (noun)	language unit (noun)
minimal meaningful language unit; it cannot be divided into smaller meaningful units	one of the natural units into which linguistic messages can be analyzed