billow vs balloon

billow and balloon both are nouns.

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

As verbs, billow and balloon are synonyms defined as:

Other synonyms of billow include inflate.

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

billow (verb)	balloon (verb)
become inflated	become inflated
rise and move, as in waves or billows	ride in a hot-air balloon
rise up as if in waves
move with great difficulty