blood line vs folk

blood line and folk both are nouns.

Word	Noun	Adjective	Verb	Adverb
blood line	Yes	No	No	No
folk	Yes	No	No	No

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

Other hyponyms of blood line include family, family line, kinfolk, kinsfolk, phratry, sept, side, breed line.

blood line (noun)	folk (noun)
the hereditary derivation of an individual	the traditional and typically anonymous music that is an expression of the life of people in a community
	people in general (often used in the plural)
	a social division of (usually preliterate) people
	people descended from a common ancestor