KEY: Exercise.
SYN: Exertion, use, practice, application, training, employment,drill.
ANT: Rest, ease, relaxation, recreation.

• Freakish
• Free
• Freight, [See CARGO]
• Frenzy
• Frequent
• Fresh
• Fretful
• Fret, [See CHAFE]
• Friable, [See FRAGILE]
• Fribble, [See TRIFLE]
• Friction
• Friend
• Friendless, [See FRIEND_and_FORLORN]
• Friendly
• Friendship, [See FRIEND]
• Frightful
• Fright, [See ALARM]
• Frigid
• Fringed, [See FIMBRIATED]
• Frippery
• Frisk
• Frisky
• Fritter
• Frivolous
• Frolic