subsistence vs livelihood

subsistence and livelihood both are nouns.

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

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

Other hypernyms of subsistence include bread and butter, keep, living, support, sustenance.

subsistence (noun)	livelihood (noun)
minimal (or marginal) resources for subsisting	the financial means whereby one lives
the state of existing in reality; having substance
a means of surviving