Thicklip is a slang term used to describe a person with a prominent lower lip. Some synonyms for this word include pouty, full-lipped, and bee-stung. These terms describe lips that are plump, juicy, and sensual, often associated with female beauty standards. Other alternatives to the word thicklip include flabby, gaping, or sagging, which may be used to describe lips that are less appealing or attractive. However, these words can be considered derogatory and should be used with caution to avoid offending others. Ultimately, the choice of synonym will depend on the context and intended meaning of the sentence.