The term "sucker" has a negative connotation and is often used to describe someone who is gullible or easily deceived. However, there are several synonyms for the word that can be used to convey a similar meaning. One such synonym is "dupe," which refers to someone who has been tricked or fooled. Another synonym is "sap," which is similarly used to describe someone who is easily taken advantage of. "Mark" and "patsy" are also synonyms that can be used to describe someone who has been deceived or taken advantage of. Using these alternative words can help to convey a similar message without using a derogatory term.