- Forty-five Num Noun
- Forty-four Num Noun
- Forty-ninth Num Noun
- Forty-one Num Noun
- Forty-second Num Noun
- Forty-third Num Noun
- Forty-year-old Adj Noun
- Forum Noun Adj
- Forward Adj Noun Verb Adv
- Forwardchaining Noun Adj
- Forwarder Noun
- Forwarding Noun Pres. Participle
- Forwardness Noun
- Foscarnet Noun Adj
- Fossa Noun Pnoun
- Fosse Noun
- Fossick Verb Noun
- Fossicker Noun Verb Adj
- Fossicking Noun Pres. Participle
- Fossil Noun Adj
- Fossilization Noun Adj
- Fossilizing Noun Pres. Participle
- Fossula Noun
- Foster Verb Adj Noun
- Foster's Noun Pnoun Adj
- Fosterage Noun
- Fosterer Noun
- Fostering Noun Pres. Participle Adj
- Fosterling Noun
- Fother Noun Verb
- Foucault Noun Pnoun
- Fouette Noun Verb Adj
- Fougasseness Noun
- Foul Adj Noun Verb Inter Adv
- Foul-up Noun
- Foulard Noun Adj
- Fouler Noun Adj
- Fouling Noun Pres. Participle
- Foulling Noun
- Foulness Noun Pnoun
- Foumart Noun
- Found Past Participle Noun Verb
- Foundability Noun
- Foundation Noun Adj
- Foundationalism Noun
- Foundationer Noun
- Founder Noun Verb Adj
- Foundering Pres. Participle Noun
- Founding Noun Adj
- Foundling Noun Adj
- Foundress Noun Adj
- Foundry Noun Adj
- Fount Noun
- Fountain Noun Verb Adj
- Fountain-head Noun Adj
- Fountainhead Noun Pnoun
- Fountainlet Noun Adj
- Four Noun Num
- Four-axis Adj Noun
- Four-axle Adj Noun