ODD ONE OUT XXX

Which word is the odd one out and why?

1. EDGE

2. EIGHT

3. OUCH

4. OUGHT

5. INK

 

Answer:

 

OUGHT is the odd one out. All the others can be preceded by SL:

 

SLEDGE (type of sled)

SLEIGHT (sleight of hand)

SLOUCH

SLINK 

 

(SLOUGH is a word, but not SLOUGHT)