A silent letter is sounded by adding a suffix or changing or deleting a letter.

Grades for suffix entries:
A. All of the following defects absent.
B. Words are not semantically related (e.g., balk - balkan).
C. Silent letter has an effect on the pronunciation (e.g., thresh - threshold).
D. Not strictly a suffix.

1.  Words should be 
  Add Suffix                        Change Letter                Delete Letter
  -----------------------------        ----------------------- -----------------------
a real - reality (A)                beat - brat                beat - bat
b bomb - bombard (A)                bomb - boob                bomb - bob
c muscle - muscular (A)                muscle - mascle                czar - car
d edge - edgar (B)                budget - budlet                bridge - bride
e line - linear (A)                ides - idea                eye - ye
f
g resign - resignation (A)        sign - sigs                sign - sig
h vehicle - vehicular (A)
i fruit - fruition (A)
j
k                                knob - klob                knob - kob
l balk - balkan (B)                could - coule                could - cold
m
n condemn - condemnation (A)
o theory - theoretical (A)
p receipt - reception (D)        psi - poi                psi - pi
q
r
s bourgeois - bourgeoisie (A)
t ballet - balletic (A)                tsar - tear                tsar - tar
u circuit - circuitous (A)
v
w cow - coward (A)                writ - wait                writ - wit
x beaux - beauxite (B)                faux - flux                faux - fax
y portray - portrayal (A)        spay - spry                spay - spy
z oyez - oyezes (A)                                        oyez - yez