breed vs spawn

breed and spawn both are nouns.

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

As verbs, breed and spawn are synonyms defined as:

Other synonyms of breed include engender.

breed (noun)	spawn (noun)
a special type	the mass of eggs deposited by fish or amphibians or molluscs
a special variety of domesticated animals within a species

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