subsistence vs existence

subsistence and existence both are nouns.

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

As nouns, existence is a hypernym of subsistence; that is, existence is a word with a broader meaning than subsistence:

Other hypernyms of subsistence include being, beingness, face of the earth.

subsistence (noun)	existence (noun)
minimal (or marginal) resources for subsisting	everything that exists anywhere
the state of existing in reality; having substance	the state or fact of existing
a means of surviving