1. What do the following words have in common?

SHED
LICE
SCOT
LINGER
INLAND

2. What do the following words have in common?

CUT
SHUT
HOLD 
SHOW
TOUCH
ROUND
SHAKE
DRESS
BREAK
STAND

Answers:

1.  Each word can be preceded by MA to make a new word:

MASHED
MALICE
MASCOT
MALINGER
MAINLAND

2. Each word can be followed by both UP and DOWN to make compound words or familiar two-word phrases.