expansion：张开，伸展；扩张，膨胀

词根词缀：ex-出 + -pans-延伸,扩展 + -ion

• favoritism
• favour
• favourable
• favourite
• fawn
• fax
• faze
• fealty
• fear
• fearful
• fearless
• feasibility
• feasible
• feast
• feat
• feather
• feather-brained
• featherweight
• feature
• febrifuge
• febrile
• February
• fecal
• feces
• feckless