I Have A Friend Who Likes ...
CALL --> CALM
SCARE --> SCARF
TON --> TOO
SHAG --> SHAH

LOW --> LOX
BEAT --> BEAU
COMA --> COMB
WARM --> WARN

CHORD --> CHORE
WAX --> WAY
SHOO --> SHOP
CHESS --> CHEST
SQUEAK --> SQUEAL

But Dislikes ...
YELL
COMFORT
POUND
RUG

TALL
LOSE
TOSE
CHILLY

BOARD
WANE
FLY
MONOPOLY
SHOUT

My friend likes words in which if you replace the last letter of the word with the letter that follows it in the alphabet, you get a new word.