multiply vs breed

multiply is not a noun while breed is a noun.

Word	Noun	Adjective	Verb	Adverb
multiply	No	No	Yes	Yes
breed	Yes	No	Yes	No

As verbs, multiply and breed are synonyms defined as:

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

multiply: have offspring or produce more individuals of a given animal or plant
breed: have young (animals) or reproduce (organisms)

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

multiply (noun)	breed (noun)
	a special type
	a special variety of domesticated animals within a species

multiply (verb)	breed (verb)
have young (animals) or reproduce (organisms)	have young (animals) or reproduce (organisms)
have offspring or produce more individuals of a given animal or plant	copulate with a female, used especially of horses
combine or increase by multiplication	cause to procreate (animals)
make multiple copies of	call forth
combine by multiplication

multiply (adverb)	breed (adverb)
in several ways; in a multiple manner