1. (noun) someone who vouches for another or for the correctness of a statement

• verifier

2. (noun) a negotiable certificate that can be detached and redeemed as needed

• coupon

1. (noun) someone who vouches for another or for the correctness of a statement

• admirer
• booster
• champion
• friend
• protagonist
• supporter

2. (noun) a document that serves as evidence of some expenditure

• document
• papers
• written document

3. (noun) a negotiable certificate that can be detached and redeemed as needed

• commercial document
• commercial instrument

1. (noun) a negotiable certificate that can be detached and redeemed as needed

• book token
• luncheon voucher
• meal ticket
• twofer

1. (noun) someone who vouches for another or for the correctness of a statement

• guarantee
• vouch
• verify
• vouch