interbreed vs interbreeding

interbreed is not a noun while interbreeding is a noun.

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

interbreed (noun)	interbreeding (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)

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