Many Arabic nouns end in ta marbuta, «ة» or «ـة». In joined reading it is pronounced as a t-sound with its appropriate vowel, but when stopped upon it becomes a still h-sound. Merely suppressing the final vowel is insufficient; the actual sound of this particular written ending changes in a pause.
«رَحْمَةٌ» — connected reading contains the ta and tanwin; at a stop the ending sounds like a still ha.
«نِعْمَةٌ» — the connected t-ending becomes still ha on stopping.
Neither rawm nor ishmam is used with this form of the ending. This must not be generalized to every written ta: the ordinary open ta «ت» has a different stopping treatment. Recognizing the written form is therefore part of accurate pronunciation.