filiation vs bloodline

filiation and bloodline both are nouns.

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

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

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

filiation (noun)	bloodline (noun)
inherited properties shared with others of your bloodline	ancestry of a purebred animal
the kinship relation between an individual and the individual's progenitors	the hereditary derivation of an individual