Mammoth Uncensored Word List:
105 words ending with fs, 5 letters long

alefs alifs baffs barfs beefs biffs boffs boyfs buffs bumfs caffs calfs chefs clefs coffs coifs confs coofs cuffs cuifs curfs daffs delfs diffs doffs duffs faffs fiefs fuffs gaffs goafs goffs golfs goofs gowfs guffs gulfs haafs haffs halfs haufs hoofs houfs howfs huffs humfs jeffs jiffs kaifs keefs kerfs khafs kiefs koffs laufs leafs liefs loafs loofs luffs meffs miffs muffs naffs naifs neifs niefs niffs nuffs pelfs poofs poufs profs puffs raffs reefs reifs riffs rolfs roofs ruffs seifs selfs serfs skyfs sowfs spifs surfs teffs terfs tiffs toffs tuffs turfs waffs waifs wakfs waqfs wolfs woofs yaffs yoofs zarfs ziffs zurfs