accompany vs companion

accompany is not a noun while companion is a noun.

Word	Noun	Adjective	Verb	Adverb
accompany	No	No	Yes	No
companion	Yes	No	Yes	No

As verbs, accompany and companion are synonyms defined as:

Other synonyms of accompany include company, keep company.

accompany (noun)	companion (noun)
	a friend who is frequently in the company of another
	one paid to accompany or assist or live with another
	a traveler who accompanies you

accompany (verb)	companion (verb)
perform an accompaniment to	be a companion to somebody
go or travel along with
be present or associated with an event or entity
be a companion to somebody