ancestry vs descent

ancestry and descent both are nouns.

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

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

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

As nouns, ancestry and descent are synonyms defined as:

ancestry (noun)	descent (noun)
inherited properties shared with others of your bloodline	the act of changing your location in a downward direction
the hereditary derivation of an individual	properties attributable to your ancestry
	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