survival vs subsistence

survival and subsistence both are nouns.

Word	Noun	Adjective	Verb	Adverb
survival	Yes	No	No	No
subsistence	Yes	No	No	No

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

survival (noun)	subsistence (noun)
something that survives	minimal (or marginal) resources for subsisting
a natural process resulting in the evolution of organisms best adapted to the environment	the state of existing in reality; having substance
a state of surviving; remaining alive	a means of surviving