In prose, correspondence among clause endings is sajʿ. In poetry, the system of recurrent final sound is qāfiyah, so sajʿ can be compared with rhyme in poetry.
This analogy does not turn every similar ending in verse into every technical variety of sajʿ. Poetry has its own metrical and rhyming constraints, while the basic sajʿ analysis compares endings of prose units.
The expression sajʿ in poetry may also describe a comparable internal sound device in verse, with a special treatment under tashṭīr.