... or do we just say "kinship terms" or "family relationship terms" or something like that?
In English we have for example "aunt" and "uncle" meaning "sister/brother of one of one's parents", but in (for example) Indian languages, there are a lot of more specific terms; so the words for "wife of my father's brother," "sister of my father," "sister of my mother," and "wife of my mother's brother" are four different words for what an English speaker would call "aunt."
I would like to say, "The _______nyms in that language are quite specific" or something like that.