profession, trade, craft; habit, practice; testimony, evidence (in court)

evidence, proof, reason, argument, indication, implication, symbolization

witness, someone who has seen something, someone bearing testimony (w/ plural - evidence)

document, evidence, proof

proven, supported by evidence or logic, confirmed

confirmation, proof

baseless, without backing/proof/foundation

irrefutable proof

proof, argument; deed, certificate, IOU, short performance