interbreeding vs interbreed

interbreeding is a noun but interbreed is not a noun.

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

interbreeding (noun)	interbreed (noun)
(genetics) the act of mixing different species or varieties of animals or plants and thus to produce hybrids
reproduction by parents of different races (especially by white and non-white persons)

interbreeding (verb)	interbreed (verb)
	breed animals or plants using parents of different races and varieties