1. What do the following words have in common?

WOE
COAT
POINT
COAST
FOUND
BOARD
GROOVE

2. Other than the first letter, what do these words have in common?

HEIR
HIGH
HATCH
HEATER
HORN
HERE

Answers:

1. Each word becomes a new one when the O is removed (either O in GROOVE).
2. Each word becomes a new one when preceded by T.