• demonstrative, evidentiary, justificatory
• demonstration, substantiation, verification
• evidence, exhibit, proof, substantiation, testimony, voucher
• bill, grade card, report, report card, school report, testimonial, warrant
• to give a proof of sg, to give proof of sg
• graduation, graduation ceremony
• to impugn a piece of evidence
• to impugn a piece of evidence
• demonstrative, discursive