Fleahopper is a word that isn't commonly used in everyday conversation, and as such, it can be challenging to come up with synonyms that can replace it. One possible option is "grasshopper," which refers to a common insect that's similar to the fleahopper. Other synonyms for this word might include "cricket," "katydid," "locust," or "cicada." All of these words describe insects that are generally small and agile, capable of jumping and running quickly. While "fleahopper" might be an interesting word to use in specific contexts, it's always good to have a few synonyms at the ready to help vary your vocabulary and keep your language fresh.