Words starting with F that are validated

• film writer — Noun – English ～ someone who writes screenplays
• Fonnesbech-Wulff — Last name – Danish
• factor X — Noun – English ～ coagulation factor that is converted to an enzyme that converts prothrombin to thrombin in a reaction that depends on calcium ions and other coagulation factors
• family Xanthorrhoeaceae — Noun – English ～ one of many subfamilies into which some classification systems subdivide the Liliaceae but not widely accepted
• family Xantusiidae — Noun – English ～ night lizards
• family Xenicidae — Noun – English ～ alternative names for the family comprising the New Zealand wrens
• family Xenopodidae — Noun – English ～ in some classifications the family of the genus Xenopus which is otherwise included in the family Pipidae
• family Xenosauridae — Noun – English ～ monotypic family of Mexican lizards
• factor XI — Noun – English ～ coagulation factor whose deficiency results in a hemorrhagic tendency
• factor XII — Noun – English ～ coagulation factor whose deficiency results in prolongation of clotting time of venous blood
• factor XIII — Noun – English ～ in the clotting of blood thrombin catalyzes factor XIII into its active form (fibrinase) which causes fibrin to form a stable clot
• family Xiphiidae — Noun – English ～ comprising the common swordfishes
• family Xylariaceae — Noun – English ～ family of fungi characterized by dark brown to black spores
• family Xyridaceae — Noun – English ～ plants of tropical to temperate regions; usually in wet places
• Francisco Jose de Goya y Lucientes — Noun – English ～ Spanish painter well known for his portraits and for his satires (1746-1828)
• Felis yagouaroundi — Noun – English ～ long-bodied long-tailed tropical American wildcat
• front yard — Noun – English ～ the yard in front of a house; between the house and the street
• fourth-year — Adjective – English ～ used of the fourth and final year in United States high school or college; "the senior prom"
• four-year-old — Adjective – English ～ four years of age
• five-year-old — Adjective – English ～ five years of age

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