Peakest is an adjective used to describe the highest point of something. There are many synonyms for this word, including summit, zenith, apex, pinnacle, and acme. These words all convey the same meaning, but can be used in different contexts. For instance, summit is often used to describe the highest point of a mountain or hill, while apex is used to describe the highest point of a career or achievement. The word pinnacle can refer to the highest point of anything, while acme is used to describe the highest point of excellence or achievement. Regardless of which synonym is used, they all convey a sense of reaching the highest level of something.