1. What do the following four-letter words have in common?

HOST
MISS
TACT
TEXT

2.  The answers to the clues below will have something in common.

A. Main topic, as in a magazine
B. Generalizations
C. Intimate conversation
D. Plasterboard

HINT:
1. INFANT could be added to the list.

Answers:

1. Each word can be changed into a new one by adding ILE at the end:

HOSTILE
MISSILE
TACTILE
TEXTILE
(INFANTILE)

2)
A. Cover story
B. Blanket statements
C. Pillow talk
D. Sheetrock

Credit: #2: 
GAMES Magazine - June, 1999
Ethan More
WHY I COULDN'T SLEEP