breed vs mongrelise

breed is a noun but mongrelise is not a noun.

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

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

Other hyponyms of breed include mongrelize, cross, crossbreed, hybridise, hybridize, interbreed.

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

breed (verb)	mongrelise (verb)
have young (animals) or reproduce (organisms)	cause to become a mongrel
copulate with a female, used especially of horses
cause to procreate (animals)
call forth