The word "cleg" is generally used to refer to a species of biting horsefly that is common in the UK. However, there are several synonyms for this word that can help to provide more variety in your writing. Some synonyms for "cleg" include gadfly, breeze fly, and deer fly, which are also used to describe similar species of biting flies. Other synonyms for "cleg" include "tabanid" and "haematopota", which are both scientific names for the insect. Using these synonyms can help to add more variety to your writing and make it more interesting and engaging for your readers.