QUICK THINKER

Four letters: Amen; Barb; Diva; Drug; Gaze; Upon. Five letters: Boast; Lunar; Ridge; Throb. Six letters: Bootee; Bounty; Citric; Occupy.

Seven letters: Equator; Masonry; Spartan; Taproot. Eight letters: Believer; Dialogue; Keelhaul; Rubicund.