Confirm
Part of speech: verb
Definition: To strengthen; to make firm. To confer the Christian sacrament of confirmation. To assure the accuracy of previous statements.
Example sentence: I think in art, but especially in films, people are trying to confirm their own existences.
Sustain
Part of speech: noun
Definition: A mechanism which can be used to hold a note, as the right pedal on a piano.
Part of speech: verb
Definition: To maintain (something), or keep it in existence.To provide for or nourish (something).To encourage (something).To experience or suffer (an injury, etc.).To confirm, prove, or corroborate (something).
Example sentence: The fact is, when men carry the same ideals in their hearts, nothing can isolate them - neither prison walls nor the sod of cemeteries. For a single memory, a single spirit, a single idea, a single conscience, a single dignity will sustain them all.