1) Collateral 2) Confirmative 3) Confirmatory 4) Confirming 5) Corroborative 6) Substantiating 7) Substantiative 8) Supportive 9) Validating 10) Validatory 11) Verificatory 12) Verifying 1) Confirmative 2) Confirmatory 3) Corroborative 4) Substantiating 5) Substantiative 6) Supportive 7) Validating 8) Validatory 9) Verificatory 10) Verifying 
• (a.) Tending to strengthen; corroborative; as, corroboratory facts.
Cor·rob'o·ra·to·ry adjective Tending to strengthen; corroborative; as, corroboratory facts.