lackey vs goody-goody

lackey and goody-goody both are nouns.

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

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

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

Other hyponyms of lackey include apple polisher, bootlicker, fawner, groveler, groveller, truckler.

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

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