stemma vs breed line

stemma and breed line both are nouns.

Word	Noun	Adjective	Verb	Adverb
stemma	Yes	No	No	No
breed line	Yes	No	No	No

As nouns, breed line is a hyponym of stemma; that is, breed line is a word with a more specific, narrower meaning than stemma:

stemma: the hereditary derivation of an individual
breed line: Breed line is offspring from the mating or breeding of individuals or organisms that are closely related genetically.

Other hyponyms of stemma include family, family line, folk, kinfolk, kinsfolk, phratry, sept, side.

stemma (noun)	breed line (noun)
an eye having a single lens	Breed line is offspring from the mating or breeding of individuals or organisms that are closely related genetically.
the hereditary derivation of an individual
a tree diagram showing a reconstruction of the transmission of manuscripts of a literary work