descent vs ancestry

descent and ancestry both are nouns.

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

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

Other hypernyms of descent include derivation, filiation, lineage.

As nouns, descent and ancestry are synonyms defined as:

descent (noun)	ancestry (noun)
the act of changing your location in a downward direction	inherited properties shared with others of your bloodline
properties attributable to your ancestry	the hereditary derivation of an individual
a movement downward
the hereditary derivation of an individual
a downward slope or bend
the kinship relation between an individual and the individual's progenitors