The term 'confirmative' is used to describe something that is SUPPORTIVE, CORROBORATORY, VERIFICATORY, AFFIRMATIVE, or SUPPORTING. It is often used to describe evidence or statements that are used to prove the truth of a claim. The related terms 'SUPPORTIVE', 'CORROBORATORY', 'VERIFICATORY', 'AFFIRMATIVE', and 'SUPPORTING' all have the same meaning as 'confirmative', but with slight variations in spelling and length. 'CORROBORATIVE' and 'CORROBORATORY' are the longest words of the group, with 13 letters each, while 'SUPPORTIVE' and 'SUPPORTING' are the shortest, with 10 letters each. 'VERIFICATORY' and 'AFFIRMATIVE' both have 12 letters.