crossbreed vs interbreed

crossbreed is a noun but interbreed is not a noun.

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

As verbs, crossbreed and interbreed are synonyms defined as:

crossbreed and interbreed: breed animals or plants using parents of different races and varieties

Other synonyms of crossbreed include cross, hybridise, hybridize.

crossbreed (noun)	interbreed (noun)
(genetics) an organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species

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