Synonyms of the word 
COSIGNER → COSIGNATORY - SIGNATORY - SIGNER
cosigner
- n. A cosignatory.
- n. (law) A person who accepts joint responsibility for the debt of another.
cosignatory
- adj. signed or signing jointly.
- n. Any of several people who sign a document together (especially a treaty).
signatory
- n. One who signs or has signed something.
- adj. Relating to a seal; used in sealing.
- adj. Signing; joining or sharing in a signature.
signer
- n. One who signs something.
- n. One who uses sign language.
If you are interested in words, visit the following sites :
- wiktionary.org/cosigner For complete definition of a word
- 1word.ws/cosigner to play with words, suffixs, prefixs, etc.