1. What do the following words have in common?

CLONE
2-BAGGER
MONARCH
MONARCH

2. What do the following words have in common?

MINI
SEAS
TEND
COUP
SURGE

HINTS:
#1: Think of synonyms for the clues.
#2: Each word can be changed to a new one by adding letters.

Answers:

1)
CLONE - TWIN
2-BAGGER - DOUBLE
MONARCH - QUEEN
MONARCH - KING - - - Bed sizes

2. Each word can be changed to a new one by adding ON at the end:

MINION
SEASON
TENDON
COUPON
SURGEON