1. What do the following four-letter words have in common?

HINT

DIRT

COST

FORT

KNOW

2. What do the following four-letter words have in common?

FEED

MOON

RUST

HIGH

CEDE

HINT: The word FACE has neither the common element in #1 or #2.

Answers:

 

1. The letters of the words are in alphabetical order.

 

2. The words are made up of consecutive letters of the alphabet.