goody-goody vs lackey

goody-goody and lackey both are nouns.

Word	Noun	Adjective	Verb	Adverb
goody-goody	Yes	Yes	No	No
lackey	Yes	No	No	No

As nouns, lackey is a hypernym of goody-goody; that is, lackey is a word with a broader meaning than goody-goody:

goody-goody: a person who behaves extremely well in order to please a superior
lackey: a person who tries to please someone in order to gain a personal advantage

Other hypernyms of goody-goody include ass-kisser, crawler, sycophant, toady.

goody-goody (noun)	lackey (noun)
a person who behaves extremely well in order to please a superior	a male servant (especially a footman)
	a person who tries to please someone in order to gain a personal advantage

goody-goody (adjective)	lackey (adjective)
affectedly or smugly good or self-righteous