breed vs pair

breed and pair both are nouns.

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

As verbs, pair is a hypernym of breed; that is, pair is a word with a broader meaning than breed:

Other hypernyms of breed include copulate, couple, mate.

breed (noun)	pair (noun)
a special type	two people considered as a unit
a special variety of domesticated animals within a species	a set of two similar things considered as a unit
	a poker hand with 2 cards of the same value
	two items of the same kind

breed (verb)	pair (verb)
have young (animals) or reproduce (organisms)	engage in sexual intercourse
copulate with a female, used especially of horses	bring two objects, ideas, or people together
cause to procreate (animals)	arrange in pairs
call forth	occur in pairs
	form a pair or pairs