Open English Wordnet
Verbs
(v)attest, certify, manifest, demonstrate, evidenceprovide evidence for; stand as proof of; show by one's behavior, attitude, or external attributes“His high fever attested to his illness”, “The buildings in Rome manifest a high level of architectural sophistication”, “This decision demonstrates his sense of fairness”
(v)demonstrate, marchmarch in protest; take part in a demonstration“Thousands demonstrated against globalization during the meeting of the most powerful economic nations in Seattle”