"Pillock" is a British slang word that is commonly used as an insulting term for someone who is considered to be foolish, stupid, or an idiot. There are several synonyms for the word "pillock" that can be used in its place, including "moron," "nincompoop," "buffoon," "simpleton," "numskull," "dolt," "dunce," and "halfwit." Each of these words has a similar connotation and can be used interchangeably with "pillock" to describe someone who lacks intelligence or common sense. Ultimately, these synonyms can be helpful for individuals who are looking for alternate ways to insult or criticize someone they feel is acting foolishly or foolish.