MAKING THE ROUNDS
Credit: GAMES/World of Puzzles
February, 2017
Makena Dyer

What do the following word have in common?

TIE                    DINER
FUEL                AILING
SALE                STRING
BEAST             BREAM

HINTS:
#1: The title is a hint.
#2: It has to do with the vowels.
#3: It has to do with changing the vowels.

Answer:

Each vowel in all of the words can be changed to O and you still have valid words:

TOO                  DONOR
FOOL               OOLONG
SOLO               STRONG
BOOST            BROOM