1. What do the following words have in common, other than each having four letters and rhyming?

LINE
NINE
PINE
SINE

2. What do the following phrases have in common?

CAR WASH
OHM'S LAW
COLD SORE
TIME MACHINE
GRAND FINALE 
BREAKING NEWS
ELECTRICAL WIRING

HINTS:
1. Each word can be preceded by two letters which will change the clues into four related words.
2. US Geography

Answers:

1)
FELINE
CANINE
LUPINE
URSINE

2. Each phrase contains two, three, or four US State Postal abbreviations:

CAR WAsh
OHm's LAw
COld sORe
tiME MAchINe
graND fINALe
breAKINg NEws 
eleCTRICAL WIRIng

Credit #1: LA Times Crossword
November 16, 2012
Gareth Bain