a fellowship; a merit-based scholarship or temporary position at an institution such as a think tank or university / fellowship; friendship or companionship

fork (utensil) / (computing) fork (metadata) / (software) fork (project) / (baseball) Short for フォークボール (fōkubōru).

(attributive) folk

Faulk (a surname or place name)

Falk (a surname or place name)

male-to-female crossdresser / trans woman

fever, an elevated body temperature / extreme excitement or enthusiasm

have a fever / be extremely excited or enthusiastic

(pathology, immunology) anaphylaxis

bioinformatics