bloodline vs ancestry

bloodline and ancestry both are nouns.

Word	Noun	Adjective	Verb	Adverb
bloodline	Yes	No	No	No
ancestry	Yes	No	No	No

As nouns, ancestry is a hypernym of bloodline; that is, ancestry is a word with a broader meaning than bloodline:

Other hypernyms of bloodline include derivation, filiation, lineage.

As nouns, bloodline and ancestry are synonyms defined as:

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

bloodline (noun)	ancestry (noun)
ancestry of a purebred animal	inherited properties shared with others of your bloodline
the hereditary derivation of an individual	the hereditary derivation of an individual