A four letter word with f and a in the middle?

* after * awful * affix * afoot * afire * often * offer * rifle * stiff * stuff * staff * aloft * nifty * softy * whiff * lofty * lefty * hefty * draft * craft * graft * puffy * drift * fluff * stuff * gruff * sulfa * snuff * swift * bluff

• awful
• buffs
• cuffs
• daffy
• defer
• elfin
• fifty
• fifth
• huffy
• hefty
• infer
• jiffy
• lefty
• lofty
• muffs
• nifty
• offer
• offed
• puffy
• rafts
• refer
• safer
• sofas
• softy
• taffy
• wafer