Have an effect (on) is a phrase that describes the action of having an influence or making a difference on something. The crossword solutions for this term are WORK (4 letters), FAZE (4 letters), IMPACT (6 letters), SWAY (4 letters), IMPINGE (7 letters), GETTO (5 letters), and IMPRESS (7 letters). Each of these words can be used to describe the action of having an effect on something, with WORK referring to the effort put in, FAZE meaning to disconcert or disturb, IMPACT being the strong effect of something, SWAY meaning to influence or control, IMPINGE meaning to encroach upon, GETTO referring to a situation where one is forced to do something, and IMPRESS meaning to make a strong impression.