creeper vs doer

creeper and doer both are nouns.

Word	Noun	Adjective	Verb	Adverb
creeper	Yes	No	No	No
doer	Yes	No	No	No

As nouns, doer is a hypernym of creeper; that is, doer is a word with a broader meaning than creeper:

Other hypernyms of creeper include actor, worker.

creeper (noun)	doer (noun)
any of various small insectivorous birds of the Northern Hemisphere that climb up a tree trunk supporting themselves on stiff tail feathers and their feet	a person who acts and gets things done
a person who crawls or creeps along the ground
any plant (as ivy or periwinkle) that grows by creeping