1. What do the following words have in common?

DOME
LEGALLY
RESTRAIN
PLEASURE
PRONOUNCEMENT

2. What do the following words have in common?

AWRY
NICHES
POTION
UNCLEAR

Answers:

1. Each word is make up of two separate, unrelated words in sequence:

DO ME
LEG ALLY
REST RAIN
PLEA SURE
PRONOUN CEMENT

2. Transposing the first two letters in each word gives a new word:

AWRY - WARY
NICHES - INCHES
POTION - OPTION
UNCLEAR - NUCLEAR

Credit: EquinoxParty 42
National Puzzlers' League - Mar. 2006
OH NO, NOT AGAIN
Michael Constant