bloodline vs blood line

bloodline and blood line both are nouns.

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

As nouns, bloodline and blood line are synonyms defined as:

Other synonyms of bloodline include ancestry, blood, descent, line, line of descent, lineage, origin, parentage, pedigree, stemma, stock.

bloodline (noun)	blood line (noun)
ancestry of a purebred animal	the hereditary derivation of an individual
the hereditary derivation of an individual