The phrase "plays for sucker" means a person who is easily fooled or taken advantage of. Synonyms for the phrase include gullible, naive, trusting, and unsuspecting. These words depict a person who is not aware of the true motives of others and can be easily manipulated. Other synonyms include simple-minded, easily deceived, and easy mark. It is important to be aware of these types of individuals in order to prevent them from being taken advantage of. By recognizing these characteristics, one can better protect themselves and others from falling victim to scams or deceitful actions.