When you want to describe something or someone that looks very similar to another thing or person, you can avoid repeating the phrase "look-a-like" by using various synonyms. Some examples of synonyms for "look-a-like" include doppelganger, twin, replica, copy, double, facsimile, clone, counterpart, likeness, simulacrum, and spitting image. These words can be used interchangeably to describe situations where two things or people have almost identical looks. Whether it's two different tree species that resemble each other or two celebrities that are often confused for one another, you can add variety to your writing by using these synonyms for "look-a-like".