FAST

Fast is a hungry four letter word.

CAVE

Cave is a four letter word, marking my return.

IDEA

Idea is a patentable four letter word.

SODA

Soda is a yucky four letter word.

WALL

Wall is an imprisoning four letter word.

WORM

Worm is a four letter word.

NAME

Name is your four letter word.

FAIR

Fair is the four letter world... I mean word... of tomorrow.

ROCK ROLL

Rock and Roll are four letter words.