interbreed vs breed

interbreed is not a noun while breed is a noun.

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

As verbs, breed is a hypernym of interbreed; that is, breed is a word with a broader meaning than interbreed:

interbreed: breed animals or plants using parents of different races and varieties
breed: cause to procreate (animals)

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

interbreed (verb)	breed (verb)
breed animals or plants using parents of different races and varieties	have young (animals) or reproduce (organisms)
	copulate with a female, used especially of horses
	cause to procreate (animals)
	call forth