Twice.
0 times
One.
1
5
4
101
1 a is in the word Scrabble. 9 a's appear in the game (English verson.
Cero times. No z in the chemical name of Titin.
many times.
Many names appear only four times. In the King James version, there are 638 words which appear only 4 times. Many of these are names. Using only ones which begin with the letter G we find Gabriel, Giddel and Guni.
426 times word without appear in the Bible
Infinite number of times;angels appear.