ancestry vs bloodline

ancestry and bloodline both are nouns.

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

As nouns, bloodline is a hyponym of ancestry; that is, bloodline is a word with a more specific, narrower meaning than ancestry:

Other hyponyms of ancestry include descent, extraction, origin, pedigree.

As nouns, ancestry and bloodline are synonyms defined as:

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

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