| frenzy | manía |
| freon | freón |
| frequency | frecuencia |
| Frequency mixer | Mesa de mezclas de audio |
| frequency modulation | modulación de la frecuencia |
| Frequency standards | Frecuencia de referencia |
| Frequency-division multiple access | Acceso múltiple por división de frecuencia |
| Frequency-division multiplexing | Multiplexación por división de frecuencia |
| Frequency-hopping spread spectrum | Espectro ensanchado por salto de frecuencia |
| frequent | frecuente |
| frequentative aspect | frecuentativo |
| frequenter | cliente asiduo |
| frequently | frecuentemente |
| fresco | fresco |
| fresh | frío |
| fresh air | aire fresco |
| Fresh blackberry | Morus nigra |
| Fresh cream | Crème fraîche |
| fresh water | agua dulce |
| freshen | retocar |
| freshen up | refrescarse |
| freshening | vivificante |
| freshens | animado |
| freshman | novato |
| freshness | frescura |
| freshwater | de agua dulce |
| Freshwater butterflyfish | Pantodon buchholzi |
| Freshwater Crocodile | Crocodylus johnstoni |
| freshwater degradation | degradación de agua dulce |
| freshwater ecosystem | ecosistema de agua dulce |
| freshwater organism | organismo de agua dulce |
| freshwater pollution | contaminación de agua dulce |
| freshwater resource | recursos de agua dulce |
| Freshwater whaler | Carcharhinus leucas |
| Fresne | Fresnes |
| Fresnel diffraction | Difracción de Fresnel |
| Fresnel integral | Clotoide |
| Fresnel lens | Lente de Fresnel |
| Fresnel zone | Zona de Fresnel |
| Fresno | Fresno |
| fret | preocuparse |
| fret over | preocuparse por |
| fretful | enojoso |
| fretfully | de mala gana |
| fretfulness | mal humor |
| Frets on Fire | Frets on fire |
| fretsaw | segueta |
| fretwork | calado |
| Freudenstadt | Distrito de Freudenstadt |
| Freudian | freudiano |
| Freudian slip | lapsus |
| Freudianism | Freudismo |
| Frey | Frei |
| Freya | Freya |
| Freya radar | Freyja |
| Freyja | Freyja |
| Freyr | Frey |
| Freyung-Grafenau | Freyung-Grafenau |
| Fri | Franco |
| friability | friabilidad |
| friable | desmenuzable |
