flatterer vs lackey

flatterer and lackey both are nouns.

Word	Noun	Adjective	Verb	Adverb
flatterer	Yes	No	No	No
lackey	Yes	No	No	No

As nouns, lackey is a hyponym of flatterer; that is, lackey is a word with a more specific, narrower meaning than flatterer:

flatterer: a person who uses flattery
lackey: a person who tries to please someone in order to gain a personal advantage

Other hyponyms of flatterer include ass-kisser, crawler, sycophant, toady.

flatterer (noun)	lackey (noun)
a person who uses flattery	a male servant (especially a footman)
	a person who tries to please someone in order to gain a personal advantage