affix vs bound form

affix and bound form both are nouns.

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

As nouns, bound form is a hypernym of affix; that is, bound form is a word with a broader meaning than affix:

affix: a linguistic element added to a word to produce an inflected or derived form
bound form: a morpheme that occurs only as part of a larger construction; eg an -s at the end of plural nouns

Other hypernyms of affix include bound morpheme.

affix (noun)	bound form (noun)
a linguistic element added to a word to produce an inflected or derived form	a morpheme that occurs only as part of a larger construction; eg an -s at the end of plural nouns

affix (verb)	bound form (verb)
stick or fasten to
add to the very end
attach or become attached to a stem word