In English orthography,  is often silent in such words as walk or could (though its presence can modify the preceding vowel letter's value), and it is usually silent in such words as palm and psalm; however, there is some regional variation.
In English orthography, the letter is commonly silent in words like walk or could (where its presence might alter the preceding vowel's pronunciation), and it is typically silent in words such as palm and psalm. There may also be variations based on region.