reproduce vs brood

reproduce is not a noun while brood is a noun.

Word	Noun	Adjective	Verb	Adverb
reproduce	No	No	Yes	No
brood	Yes	No	Yes	No

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

reproduce: have offspring or produce more individuals of a given animal or plant
brood: sit on (eggs)

Other hyponyms of reproduce include propagate, fructify, set, breed, multiply, cover, hatch, incubate.

reproduce (noun)	brood (noun)
	the young of an animal cared for at one time

reproduce (verb)	brood (verb)
have offspring or produce more individuals of a given animal or plant	sit on (eggs)
repeat after memorization	think moodily or anxiously about something
make a copy or equivalent of	be in a huff; be silent or sullen
recreate a sound, image, idea, mood, atmosphere, etc.	be in a huff and display one's displeasure
	hang over, as of something threatening, dark, or menacing