| fount | fonte |
| fountain | fonte |
| Fountain of Youth | Fonte da juventude |
| fountain pen | caneta |
| Fountains in Rome | Lista de fontes de Roma |
| Fountains of Wayne | Fountains of Wayne |
| fountainy | fonteesa |
| four | quatro |
| Four Asian Tigers | Tigres asiáticos |
| Four bar linkage | Mecanismo de quatro barras |
| Four bombs rock London | Londres é vítima de ataque terrorista |
| Four color theorem | Teorema das quatro cores |
| Four Corners | Four Corners |
| Four Corners Monument | Four Corners |
| Four fours | Os quatro quatros |
| Four Hitokiri of the Bakumatsu | Hitokiri |
| Four Horsemen of the Apocalypse | quatro Cavaleiros do Apocalipse |
| Four humours | Teoria humoral |
| four hundred | quatrocentos |
| Four Knights Game | Abertura dos Quatro Cavalos |
| Four Noble Truths | Quatro Nobres Verdades |
| four o'clock | quatro horas |
| four of a kind | quadra |
| Four on the Floor | Four on the Floor |
| Four Rooms | Four Rooms |
| Four Seasons | Le quattro stagioni |
| Four sons of Horus | Filhos de Hórus |
| four stroke engine | motores a quatro tempos |
| Four Temperaments | Teoria humoral |
| four thousand | quatro |
| four times as much | quádruplo |
| Four-character idiom | Provérbios chineses |
| Four-color process | CMYK |
| four-cornered | quadrangular |
| four-dimensional | quadridimensional |
| four-engined | quadrimotor |
| Four-eyed fish | Anablepidae |
| four-eyes | quatro olhos |
| four-footed | quadrúpede |
| four-in-hand | carruagem puxada a quatro cavalos |
| Four-in-hand knot | Nó americano |
| four-lane highway | auto-estrada de quatro pistas |
| four-leaf clover | trevo de quatro folhas |
| four-legged | quadrúpede |
| four-o-four (slang) | objeto esquecido (gíria) |
| four-poster | cama de quatro colunas |
| four-poster bed | cama de quatro colunas |
| four-speed gear | câmbio de quatro velocidades |
| four-stroke engine | motor a quatro tempos |
| Four-toed salamander | Hemidactylium |
| four-wheel | de quatro rodas |
| four-wheel drive | tração nas quatro rodas |
| four-wheeler | veículo de quatro rodas |
| Fourier | Fourier |
| Fourier analysis | Análise harmónica |
| Fourier optics | Óptica de Fourier |
| Fourier series | Série de Fourier |
| Fourier transform | Transformada de Fourier |
| fourpple | quatro |
| foursome | quarteto |
| foursquare | decisivamente |
