affirmer

Person who validates

An affirmer is someone who affirms—declares something to be true, expresses agreement, or offers encouragement and validation.

The term appears most often in legal contexts, where an affirmer makes a formal declaration in place of a sworn oath: The witness was an affirmer rather than an oath-taker.

supporter

encourager

One who heartens others

champion · believer · ally · patron · sponsor · booster · proponent · helper · cheerleader · upholder

verification

validator

One who confirms authenticity

certifier · endorser · ratifier · prover · attestor · documenter · accreditor · witness · second · countersigner

declaration

declarer

One who states openly

attester · testifier · witness · voucher · certifier · claimant · confessor · professed · sworn witness · deponent

Opposites
stance toward claims or propositions

affirmerdenier

One who contradicts

negator · rejecter · refuter · disavower · repudiator

emotional/psychological stance toward ideas or people

affirmercritic

One who judges merit

detractor · disparager · belittler · naysayer · denigrator

epistemic attitude

affirmerdoubter

One who disbelieves

skeptic · disbeliever · questioner · agnostic · cynic

Phrases
Family

affirm, affirmation, affirmative, affirming, reaffirm, affirms, reaffirmed, disaffirm, affirmatively

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Used worldwide · Timeless · Abstract · Positive · Everyday, not technical · Rated G