Narcissism is the pursuit of gratification from vanity or egotistic admiration of one's own attributes. The term originated from Greek mythology, where the young Narcissus fell in love with his own image reflected in a pool of water.
In general, synergy (pronounced SIN-ur-jee, from Greek sunergia, meaning cooperation, and also sunergos, meaning working together) is the combined working together of two or more parts of a system so that the combined effect is greater than the sum of the efforts of the parts.
synergy. 1  the interaction of elements that when combined produce a total effect that is greater than the sum of the individual elements, contributions, etc.; synergism. 2  Physiology, Medicine/Medical. the cooperative action of two or more muscles, nerves, or the like. 3  Biochemistry, Pharmacology. the cooperative action of two or more stimuli or drugs.