Two more letters English keeps around just for the spelling.
swordSORD
Silent W after S.
wristRIST
Silent W before R.
writeRYTE
Silent W before R.
wrongRAWNG
Silent W before R.
answerAN-ser
Silent W in the middle.
hourOWR
Silent H at the start.
honestON-est
Silent H at the start.
heirAIR
Silent H at the start.
ghostGOHST
The H here is part of a GH digraph, not silent on its own — but the pairing surprises many learners.
vehicleVEE-ih-kul
The H in the middle is silent.