balloon vs expand

balloon is a noun but expand is not a noun.

Word	Noun	Adjective	Verb	Adverb
balloon	Yes	No	Yes	No
expand	No	No	Yes	No

As verbs, expand is a hypernym of balloon; that is, expand is a word with a broader meaning than balloon:

balloon (noun)	expand (noun)
large tough nonrigid bag filled with gas or heated air
small thin inflatable rubber bag with narrow neck

balloon (verb)	expand (verb)
become inflated	grow vigorously
ride in a hot-air balloon	exaggerate or make bigger
	become larger in size or volume or quantity
	expand the influence of
	make bigger or wider in size, volume, or quantity
	add details, as to an account or idea; clarify the meaning of and discourse in a learned way, usually in writing
	extend in one or more directions