A word ending in tanwin may, in an eligible rawm stop, retain only a very faint trace of its final vowel. The n-like component of tanwin is not pronounced as part of this stop. Rawm therefore must not be confused with reading the full connected ending, tanwin included.
«كِتَابٌ» — when joined, its tanwin supplies an n-like sound; a rawm pause gives at most a faint trace of dammah, without that n sound.
«بَيْتٍ» — a small trace of the underlying kasrah may remain with rawm, but the n-like tanwin does not survive.
Rawm is restricted to appropriate kasrah and dammah endings; the presence of tanwin does not authorize rawm on a final fathah. The special treatment of ta marbuta also remains in force. The last vowel, the tanwin n-sound and the permitted form of pausing must be considered separately.