bound form vs affix

bound form and affix both are nouns.

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

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

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

Other hyponyms of bound form include combining form.

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

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