people vs family line

people and family line both are nouns.

Word	Noun	Adjective	Verb	Adverb
people	Yes	No	Yes	No
family line	Yes	No	No	No

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

Other hypernyms of people include family, folk, kinfolk, kinsfolk, phratry, sept.

people (noun)	family line (noun)
(plural) any group of human beings (men or women or children) collectively	people descended from a common ancestor
the body of citizens of a state or country
members of a family line
the common people generally

people (verb)	family line (verb)
fill with people
furnish with people