Synonyms of signatory

2 Syllables
sigil, gawkers, signer, viewers, witness, viewer, signers, gawker
3 Syllables
registrar, witnesses, recorder, attestant, certifiers, scrivener, testifier, notary, recorders, endorser, certifier, testifiers
4 Syllables
rubbernecker, undersigned
5 Syllables
corroborator, corroborators