flunky vs yes-man

flunky and yes-man both are nouns.

Word	Noun	Adjective	Verb	Adverb
flunky	Yes	No	No	No
yes-man	Yes	No	No	No

As nouns, flunky and yes-man are synonyms defined as:

Other synonyms of flunky include flunkey, stooge.

flunky (noun)	yes-man (noun)
a person of unquestioning obedience	a person of unquestioning obedience
a male servant (especially a footman)