When it comes to describing the act of stretching, there are many synonyms that can be used in place of the word "stretchest". Some common alternatives include "extend", "lengthen", "elongate", "pull", and "reach". Each of these words can be used in slightly different contexts, adding variety and nuance to your writing. For example, "extend" might be used to describe a movement that reaches outwards, while "lengthen" might be used to describe a movement that increases in size or duration. Ultimately, the choice of synonym depends on the specifics of what you're describing, but having a wide range of options can help you express yourself with clarity and precision.