FOUR BY WILL SHORTZ

1. Two six-letter words differ by only their first letter. The first word is one of a group of twelve, and the second word is one of a group of eight.

2. Two words begin with the same two letters, but one in reverse order from the other.. The words are opposites.

3. Two common girls' names each have six letters. The names differ by only the fifth letter in each word.

4. The two words INK and OUGHT share an interesting quality. Can you determine what it is?

HINTS:
1. The first letter of the first word is C, and the first letter of the second words is D.
2. The first letters are UR and RU.
3. The first letter of each name is M.
4. It has to do with the same two letters.

Answers:

1. CANCER (Zodiac sign) and DANCER (reindeer)
2. URBAN and RURAL
3. MARSHA and MARTHA 
4. THink and THought