Half rhyme, also known as imperfect rhyme, near rhyme, lazy rhyme, or slant rhyme, is a sort of rhyme generated by words that have similar but not identical sounds. In most cases, the vowel segments alter while the consonants remain the same, or vice versa. For example, "tune" and "moon" are half-rhymes because they both start with the same letter ("t") and end with different letters ("n" and "m"). Words used in poetry, music, and speech often follow a loose pattern when combined with other such words—a pattern that can be difficult to predict. Loose rhymes are commonly found in songs, poems, and prose texts. They add flavor and interest to the writing, but you should never rely exclusively on them. Many readers will find loose rhymes hard to understand, while others may even think they're funny! Loose rhymes can be classified into two types: internal loose rhymes and external loose rhymes. In internal loose rhymes, each word inside the pair has the same number of syllables. "Tune/moon" is an example of an internal loose rhyme. In external loose rhymes, however, the words in the pair do not have the same number of syllables. "Flavor/pastor" is an example of an external loose rhyme.