least common denominatornoun

• 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
• frisson
• frisée
• frit
• frit fly
• fritillary
• frittata
• fritter
• fritto misto
• frivolous
• frizz