Existence rhymes with:
coexistence, coexistence, resistance, resistence, assistance, coexistence, consistence, distance, insistence, outdistance, persistence, resistance, resistence, self-subsistence, subsistence
Existence sounds like:
ecosystems, eighteen's, eighteens, ejecting, equating, equations, esteem's, estonians, exacting, exactions, exceeding, exciting, executing, executions, exhausting, existing, exiting, extinguish, exuding