The crossword solutions for the term ONE WHO TAKES SIDES are ALLY (4 letters) and EATER (5 letters). An ALLY is someone who is a friend or supporter of another person or group, while an EATER is someone who consumes food. Both terms can be used to describe someone who takes sides in a conflict or dispute. An ALLY is someone who actively supports one side, while an EATER is someone who passively chooses one side over another.