Technically, a Ghunnah is a sound that emanates from the (the Khayshoom) rather than the throat or the tongue. It is a resonant, humming sound.
Ghunnah also occurs during specific Tajweed rules involving (noon with a sukoon) or Tanween (double vowels). In these cases, the nasal sound is applied to the following letters: ghunnah letters
The letter always carries a natural nasal sound. However, when the Noon has a Shaddah (نّ), the Ghunnah must be emphasized and held for two counts. This is known as Ghunnah Mushaddadah . 2. Meem (م) Technically, a Ghunnah is a sound that emanates
Found in letters with a Shaddah (نّ or مّ) and in Idgham with Ghunnah. Complete (Kamilah): Found in Ikhfa’ and Iqlab. In these cases, the nasal sound is applied
Instead of pronouncing a sharp "n" sound, the reciter blends it into the following letter while letting the sound vibrate through the nose. Ikhfa’ (Hiding)