If you mean a silent "u," some of them are...
guide
intrigue
(using the older spelling) several words ending in -gue, as catalogue.
Also, certain words in which qu is pronounced as k rather than kw, as critique.
Some words with a silent S:AisleAproposArkansasBourgeoisChamoisChassisDebrisHors d'oeuvresIllinoisIslandIslePrecisRendezvous
Some examples of English words with a silent P are pneumonia, pneumatic, psychic and psychiatrist.
Some words with silent 'ng' include 'finger' and 'song'. Some words with silent 'nk' include 'honor' and 'bunk'.
Some words with silent "th" are: Asthma Christmas Thomas Honest
hello
Some examples of words with silent "s" are "island," "aisle," "debris," and "apricot."
Some words with silent "c" include: muscle, scissors, indict, and victuals.
Some examples of words with a silent "n" include "autumn," "column," and "condemn."
Some examples of words that begin with a silent "b" are: bdecause bdelight bdoubtful
Some words with silent "mn" include condemn, autumn, column, damn, hymn.
Some words that start with a silent "b" include: subtle, thumb, and knob.
Some words that have a silent "y" are "yacht," "yogurt," and "yolk." These words are pronounced without the "y" sound at the beginning.