Step1
Silent Letters in English Words
There is no clear way to know about all the silent letters in English Words.
The best you can do is to make lists and circulate among your friends to find and add more such words.
(a) Silent Consonants
Silent Letter B
‘b’ is silent in the words ending with ‘mb’.
Climb, Crumb, Dumb, Comb, Lamb
Silent Letter B
‘b’ is mostly silent when it is followed by ‘t’.
Debt, Doubtful, Subtle
(But not in some words, e.g. 'Obtain', 'Unobtrusive')
Silent Letter C
‘c’ is mostly silent in the words beginning with ‘sce’ or ‘sci’
Muscle, Scène, Scent, Science, Scissors
Silent Letter C
‘c’ is silent in the words ending with ‘scle’
Muscle, Corpuscle
Silent Letter D
‘d’ is silent in the following common words.
Handkerchief, Sandwich, Wednesday
Silent Letter G
‘g’ is silent in the words beginning with ‘gn’.
Gnome, Gnaw, Gnats, Gnosis, Gnu
Silent Letter G
‘g’ is often silent when it is followed by ‘n’ in the middle or end of a word.
Champagne, Foreign, Sign, Feign
Silent Letters GH
‘gh’ is silent when it is followed by ‘t’.
Ought, Fought, Thought, Taught, Daughter
Night, Light, Might, Right, Fight
Silent Letters GH
‘gh’ is mostly silent in the words when it is at the end.
High, Sigh, Weigh, Neigh, sleigh
Letters GH
‘gh’ sounds ‘ff’ when preceded by ‘ou’
Cough, Rough, Enough, Tough
Silent Letter H
‘h’ is silent in the words beginning with ‘wh’. However some people whisper ‘h’ before the ‘w’.
What, Wham, Whip, Whiz, When, Where, Whether, Why
Silent Letter H
‘h’ is silent, in many words, when it is at the beginning.
In such cases the article ‘an’ is used.
Hour, Honest, Honour, Heir, Herb
Silent Letter H
‘h’ is silent in the words ending with ‘h’ and preceded by a vowel.
Hah, Mynah, Cheetah, Sarah, Messiah
Silent Letter H
‘h’ is silent in the words ending with ‘h’ and preceded by a consonant.
Myrrh , Catarrh
Silent Letter H
‘h’ is silent in the words beginning with ‘rh’
Rhyme, Rhubarb, Rhythm, Rhombus
Silent Letter K
‘k’ is silent in the words beginning with ‘kn’.
Knife, Knee, Know, Knock, Knowledge
Silent Letter L
‘l’ is often silent when it is before ‘d’ and preceded by ‘ou’.
Would, Should, Could
Silent Letter L
‘l’ is often silent when it is before ‘f’
Half, Calf
Silent Letter L
‘l’ is often silent when it is before ‘k’
Talk, Walk, Balk
Step2
Silent Letter L
‘l’ is often silent when it is before ‘m’
Calm, Balm, Salmon
Silent Letter N
‘n’ is silent when it is behind ‘m’ at the end of a word.
Autumn, Hymn, Damn, Column
Silent Letter P
‘p’ is silent in the words beginning with ‘pn’
Pneumatic, Pneumonia, pneumonic
Silent Letter P
‘p’ is silent in the words beginning with ‘ps’
Psalm, Psychiatry, Psychology
Silent Letter P
‘P’ is silent in the words beginning with the suffix ‘psych’.
Psychiatrist, Psychotherapy, Psychotic
Silent Letter P
‘p’ is silent in the words beginning with the suffix ‘pneu’.
Pneumatic, Pneumonia
Silent Letter S
‘s’ is mostly silent when it is before ‘l’ in some words.
Island, Isle
Silent Letter T
‘t’ is silent in the following common words.
Often, Castle, Fasten, Listen, Rustle, Glisten,
Thistle, Whistle, Wrestle, Christmas, Listening
Silent Letter W
‘w’ is silent in the words beginning with ‘wr’.
Wrap, Wreck, Wrench, Write, Wrong
Silent Letter W
‘W’ is silent in the following words.
Who, Whose, Whom
(b) Silent Vowels
Silent Vowel E
Silent vowel ‘e’ at the end as in the word ‘have’
Because, Cheese, Give, Have, Horse, House, Love, Pause, Please, Purse
Silent Vowel U
‘u’ is silent when it is after ‘g’ and before a vowel.
Guess, Guidance, Guitar, Guest
Silent Vowel U
Silent vowel ‘u’ as in the word ‘guess’
Biscuit, Build, Disguise, Guarantee, Guard, Guess, Guest, Guide, Guilty, Guitar
Silent Vowels UE
Silent vowels ‘ue’ as in the word ‘tongue’
Catalogue, Intrigue, League, Plague, Rogue, Tongue, Vague
Silent letter E in English Words
(a) ‘E’ is silent at the end of a word and makes the consonant in front of it say its alphabet name.
Ate
Use
Bite
Code
Cube
Cute
Dude
Face
Hate
Hide
Hope
Joke
Jute
Made
Mate
Mope
Note
Pale
Pine
Ride
Robe
Tape
Wake
Wine
Close
Craze
Space
Stage
Whale
Arrive
Escape
Bagpipe
Promote
Creative
Exercise
Guidance
Pleasure
Relative
Surprise
Valuable
Enclosure
Ignorance
Insurance
Narrative
Believable
Literature
Cooperative
Legislature
Resemblance
(B) ‘E’ is silent in the middle of a word and makes the consonant in front of it say its alphabet name.
Hikers
Lately
Museum
Hopeless
Revision
Rehearsal
Completion
Television
Authority 
