The following words have something in common that has nothing to do with their meanings. What is it?

NO
BUS
CAP
CRY
HEY
MARCH
DATING

HINT:
The same two letters will change each word into a new one.

Answer:

Adding or inserting the letters ON in each word will change it into a new one:

NOON
BONUS
CAPON
CRONY
HONEY
MONARCH
DONATING 

Credit: Nancy Salomon
CATCHING ON