indorser vs signer

indorser and signer both are nouns.

Word	Noun	Adjective	Verb	Adverb
indorser	Yes	No	No	No
signer	Yes	No	No	No

As nouns, signer is a hypernym of indorser; that is, signer is a word with a broader meaning than indorser:

indorser: a person who transfers his ownership interest in something by signing a check or negotiable security
signer: someone who signs and is bound by a document

Other hypernyms of indorser include signatory.

indorser (noun)	signer (noun)
someone who expresses strong approval	someone who signs and is bound by a document
a person who transfers his ownership interest in something by signing a check or negotiable security	someone who can use sign language to communicate