filfil filius filli- fillis firlls firlus firsts fislis fissi- fitful fittit flirts fluffs fluris flurri frills frisii fritts friuli fruits fruti- frutti fulfil furfur furrfu fusils futtsu i-suit ifitis ifrits illfit illful illlit iris-t iritis isists istisu isurus itfits itslit ittiri lifful lifull lilius lillis lilliu liluri lituit lituus liulis ltsulu lufful lullus lurulu lutist lutris rififi riltsi rititi ritius ruffus rurutu russus rutuli ruutli siiiii silili silius siriri sirius sirris sirsir sirtir sirtis sirtsi sisisi sistil sistri sisulu sluffs sssfrs stiffs stilfs stilli stills stilts stilus stirit striff strift striif strull strust struts strutt stu-ii stuffs stuill stulls stulti sturts suffit sufli suists sulfur sulili surful surili surtur susulu susurr tiff-f tiflis tilius tillis tilsit tiltil tirful tirrit tisili titiri titius titlis tituli tituss trills trisil trists trisul tritsu truful truiff truitt trulli trulls trusts tsuris tsurui tuiuti tullus turis turist turris turssu turtur tururu tussis tussur tutill tuttis tuttul tuttut ulfuls ulitis ulutiu uritis usiris ussuri ustult usturi utilis