blood line vs bloodline

blood line and bloodline both are nouns.

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

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

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

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