Cockler is a noun that refers to a person who collects cockles, which is a type of edible shellfish. However, there are a few synonyms that can be used to describe a cockler. Clam digger, musseler, and oyster collector are all words that can be used to describe someone who gathers shellfish from the sea. These synonyms work well when trying to diversify your writing and avoid repetition. Additionally, if you are unfamiliar with the word cockle or want to be more specific about the type of shellfish being collected, using these synonyms may be beneficial.