a person or thing that looks like or closely resembles another; double.

a compatible

The leading brand of computer was expensive so they bought cheap look-alikes.

a pill or capsule that contains nonprescription stimulants, as caffeine and ephedrine, but is made to appear like one containing illegal or prescription stimulants, as amphetamine or biphetamine.

being or characteristic of a look-alike.

noun

carbon copy , clone , copy , dead ringer , dead ringer * , double , duplicate , impersonator , match , mirror image , replica , ringer , spitting image , spitting image * , stand-in * , twin