A limerick feature is a type of poem that consists of five lines and follows a specific RHYME scheme. The first, second, and fifth lines must RHYME with each other, while the third and fourth lines must also RHYME with each other. The crossword solutions for this term are 'RHYME' (5 letters) and 'endrhyme' (8 letters). RHYME is defined as a similarity in sound between two words or phrases, while endrhyme is a type of RHYME that occurs at the end of two or more lines of poetry.