person who signs a borrower's promissory noteto give a loan additional security or to enhance the quality of a loan. A comaker has a liability similar to an endorser or guarantor. although in a strict legal sense a guarantor or endorser cannot be compelled to honor the note until certain conditions are met.

person who endorses a promissory note as a favor to the borrower, without compensation or benefit. An endorser or cosigner's signature enables the borrower to qualify for credit, or to obtain credit at more favorable terms. The endorser is a guarantor or surety, and remains secondarily liable in event of default.