Synonyms for Sustenance (same or very similar meaning)
WordNet sense 1 (the financial means whereby one lives):
keep, livelihood, living, supportWordNet sense 2 (a source of materials to nourish the body):
aliment, nourishment, nutriment, nutrition, victuals, alimentation, alimentWordNet sense 3 (the act of sustaining life by food or providing a means of subsistence):
maintenance, upkeep, sustainment, sustentationFrom the ODE community, based on WordNetadd/edit