family vs stemma

family and stemma both are nouns.

Word	Noun	Adjective	Verb	Adverb
family	Yes	No	No	No
stemma	Yes	No	No	No

As nouns, stemma is a hypernym of family; that is, stemma is a word with a broader meaning than family:

family (noun)	stemma (noun)
primary social group; parents and children	an eye having a single lens
people descended from a common ancestor	the hereditary derivation of an individual
a social unit living together	a tree diagram showing a reconstruction of the transmission of manuscripts of a literary work
(biology) a taxonomic group containing one or more genera
a collection of things sharing a common attribute
an association of people who share common beliefs or activities
a loose affiliation of gangsters in charge of organized criminal activities
a person having kinship with another or others