The phrase "use for own ends" implies selfish or manipulative behavior. There are various synonyms to describe this type of behavior such as exploitation, manipulation, domination, and subjugation. To manipulate or exploit someone means to use their vulnerabilities or weaknesses to gain an advantage. Domination and subjugation imply the use of force and power to control and oppress others. Nonetheless, it is important to note that manipulating others for personal gain is unethical and should be avoided. Fair treatment and mutual respect lead to healthier and more productive relationships, both in personal and professional contexts.