morpheme vs bound form

morpheme and bound form both are nouns.

Word	Noun	Adjective	Verb	Adverb
morpheme	Yes	No	No	No
bound form	Yes	No	No	No

As nouns, bound form is a hyponym of morpheme; that is, bound form is a word with a more specific, narrower meaning than morpheme:

morpheme: minimal meaningful language unit; it cannot be divided into smaller meaningful units
bound form: a morpheme that occurs only as part of a larger construction; eg an -s at the end of plural nouns

morpheme (noun)	bound form (noun)
minimal meaningful language unit; it cannot be divided into smaller meaningful units	a morpheme that occurs only as part of a larger construction; eg an -s at the end of plural nouns