cosignatory or co-signatory/kohʹsignət(ə)ri/ noun (pl -ies) (pl cosignatories)

• friendly society
• frier
• fries
• Friesian
• frieze
• frig
• frigate
• frigate bird
• fright
• frighten
• frightener
• frighten/scare somebody out of their wits
• frightful
• frigid
• frigid zone
• frill
• frilled lizard
• fringe
• fringe benefit
• fringing reef
• frippery
• Frisbee
• Frisian
• frisk
• frisky