full blood vs descent

full blood and descent both are nouns.

Word	Noun	Adjective	Verb	Adverb
full blood	Yes	No	No	No
descent	Yes	No	No	No

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

Other hypernyms of full blood include extraction, origin.

full blood (noun)	descent (noun)
descent from parents both of one pure breed	the act of changing your location in a downward direction
	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