The term 'selfish one' can be described by four different crossword solutions: egoist (6 letters), HOG (3 letters), TAKER (5 letters), and dog in the manger (14 letters). An egoist is someone who is excessively concerned with their own interests and desires, while a HOG is someone who is greedy and selfish. A TAKER is someone who takes more than they give, and a dog in the manger is someone who selfishly prevents others from having something that they themselves do not want or need. All of these terms describe someone who is selfish and puts their own interests before those of others.