A poet can use rhymes defined by nature of similarity to write a poem. This group includes nine separate sub-groups of rhymes. Perfect rhyme, full rhyme and true rhyme belong to the first sub-group, which refers to the norms that can be instantly recognized. Rhymes that are close, but not exact are the imperfect or half rhymes. Example for this kind of rhyming is "glorious/nefarious." Eye rhyme is another type of rhyming that belongs to this category. It refers to words that are similar to spell, such as "why/envy". The other sub-groups are identical rhyme, rich rhyme, assonant and consonant rhymes, scares rhyme, and macaronic rhyme where a poet uses two or more languages.
This category includes four rhyming sub-groups. Masculine rhyme refers to the rhyme on the stressed syllables of words. Feminine rhyming is rhyming of double syllable endings, such as "salubrious/lugubrious". Light rhyme and wrenched rhyme also belong to this group. Example for the first one is "frog/dialog", where occurs rhyming of a stressed syllable with a secondary stress. Wrench rhyming is common in ballads and folk poetry where a stressed syllable rhymes with an unstressed one.
These types of rhymes are divided into two sub-groups. The first ones are rhymes defined by position in the line, while the second ones include rhymes defined by position in the verse. Terminal and initial rhymes are those that occur at line ends or beginnings. The first sub-group also includes internal, medial and interlaced rhymes. By position in the verse, rhymes can be interlocking, intermittent, inserted, irregular, occasional and thorn.
There are three types of rhymes across word boundaries. These are the broken, linked, and apocopated rhyme. A broken rhyme is the one that uses two or more words, or where one world is broken over the line end. Gerald Manley Hopkins used linked rhymes where the rhyme begun at the end of one line and continued at the beginning of the next one.