The word "snarler" can be substituted with a variety of synonyms depending on the context. Some possible synonyms include growler, barker, yapper, or howler, all of which are often used to describe dogs. Other possible synonyms for "snarler" might include snapper or curmudgeon, both of which can be used to describe someone who is grumpy or ill-tempered. In the context of automobiles, "snarler" might be substituted with synonyms such as revver or muscle car, both of which suggest a vehicle with high-performance capabilities. Ultimately, the choice of synonym will depend on the specific context in which the word is being used.