I. noun
1.
Synonyms: testimony , attestation, confirmation, evidence, proof, testament, testimonial
2.
Synonyms: spectator , beholder, by-sitter, bystander, eyewitness, looker-on, observer, onlooker, viewer, watcher
II. verb
1.
Synonyms: certify 1, attest, vouch
Related Word: affirm; endorse, subscribe
2.
Synonyms: indicate 2, announce, argue, attest, bespeak, betoken, testify