I blow my nose at you, so-called Arthur King, you and all your silly English knnnigits!

I've heard that all 26 letters in the English alphabet are mute/silent in one word or another. I've included some examples, but am stumped on a few.  Any help with F or V?

A: bread, marriage, pharaoh
B: debt, subtle, thumb, numb
C: indict, yacht, scene
D: edge, handkerchief, Wednesday
E: more, height, steak, every
F: fifth ?
G: gnarled, reign, tight, gnome, foreign
H: ghost, heir, through, hour
I: business, seize
J: marijuana
K: knob, sackcloth, knife, knight, knee
L: half, salmon, would
M: mnemonic
N: column, hymn, autumn
O: country, laboratory, people, phoenix, jeopardy
P: cupboard, psychology, receipt, pneumonia
Q: lacquer, racquet
R: February
S: debris, island, aisle
T: gourmet, listen, tsunami
U: circuit, dough, gauge, guard, court
V: ? ? ?
W: answer, two, wrist, wrestle, wreck
X: faux
Y: prayer
Z: rendezvous