With all due respect, this is quite pathetic. It has been four years and you lot have not even been able to write down a full list with each of the silent letters. AYE, silent letters may occur literally from A to Z, ye have been just too clumsy to prove the theory.

A - bargAin, heAlth, dictionAry (British English), practicALly
B - bomB, deBt
C - indiCt, viCtUals, sCissors
CH - yaCHt
D - WeDnesday, hanDsome, anD (unaccented), WinDsor, briDge
DH - ceiliDH
E- Europe, bluE
F - haLFpenny (also written as ha'penny)
G - siGn
GH - liGHT
GN - GNash
H - Hour, JoHn, wHale
I - fruit, said, air
J - mariJuana, Don Juan, riJsttafel
K - Kneel, blaCKguard
L - taLk, aLmond, Sherlock HoLmes
M - Mnemonic, Mnemonics, Mnemonise
N - solemN, soi-disant
O - jeOpardy, peOple, chocOlate
P - Psychoogy, Ptolemy, receiPt, couP, toPgallant
Q - mosQUito, Tequila, CoLQUhoun
R - , foyeR, bustieR, atelieR, hotelieR, sommelieR, foRecAsTle (sailor's use = fo'c'sle)
S - iSle,debriS
T - lisTen, mustn't, asTHma, sacheT,
U - bUild, tongUE, beautifULly
V - fiVEpence (= fippence), MilNgaVie,DaVEntry,LeVeson-Gower, Vsevolod
W - ansWer, Wrist, GreenQich
X - fauX paS, billet-douX, SiouX, BordeauX
Y - praYer, maYor, saYs, Samuel PepYs
Z - rendeZvous, laisseZ-faire, cheZ

There, I won and I didn't even break sweat. Those of you who say foreign words are not allowed: are you brainless? English has been forged from many a tongue, moreover this is the very reason why it has manifold spelling in the first place! O, poverty in wit! Anywise it be, I hereby accept the gold medal.