forgather vs flock

forgather is not a noun while flock is a noun.

Word	Noun	Adjective	Verb	Adverb
forgather	No	No	Yes	No
flock	Yes	No	Yes	No

As verbs, flock is a hyponym of forgather; that is, flock is a word with a more specific, narrower meaning than forgather:

forgather (noun)	flock (noun)
	a group of birds
	a group of sheep or goats
	a church congregation guided by a pastor
	an orderly crowd
	(often followed by `of') a large number or amount or extent

forgather (verb)	flock (verb)
collect in one place	come together as in a cluster or flock
	move as a crowd or in a group