There are several synonyms for the word "avail" which essentially means to use something or make it helpful in achieving a desired outcome. Some of the most commonly used synonyms for "avail" include "benefit," "assist," "serve," "help," "utilize," and "employ." Each of these words carries its own nuanced meaning, but they all share the fundamental idea of utilizing something or someone in the most effective way possible in order to achieve a desired result. Other synonyms for "avail" might include "gain," "profit," "leverage," "exploit," or "make use of," depending on the context and the desired tone of the sentence.