huddler vs doer

huddler and doer both are nouns.

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

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

Other hypernyms of huddler include actor, worker.

huddler (noun)	doer (noun)
a member of a huddle	a person who acts and gets things done
a person who crouches