1. What do the following words have in common?

Banana
Assess
Dresser
Grammar
Potato
Revive
Uneven
Voodoo

2. What do the these three words have in common?

RAY

ION

AGE

3. What do the following words have in common?

DO

FOR

TOR

FLU

HAS

OPERA

HINTS:
1. It has to do with the first letter of each word.
2. Each word can be preceded by the same four-letter word.

3. The same two letters can be added to each word.

Answer:

1. If you move the first letter to the end of each word, the word reads the same, but backward.
    [Note from JA: See also IN COMMON post of 5/1/16.]

2. Each word can be preceded by PORT:

PORTRAY/PORTION/PORTAGE

3. The letters TE can be added to each word:

DOTE
FORTE
TORTE
FLUTE
HASTE
OPERATE