FORMULISING

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figs film filo fils fino fins firm firn firs flir flog flus fogs foil foin fons form foul four frig frog from frug fugs funs furl furs gins girl girn giro glim glom glum gnus golf gorm grim grin grum gulf guls gums guns iglu info inro ions iris iron limn limo ling lino lins lion liri logs loin long lorn lour lugs lums lung migs milo mils mini miri mirs miso mogs moil mols mons morn mors mugs muni muns muon nils nims nisi nogs noil noir noms nori norm nous nurl oils onus ours rifs rigs rims ring rins roil rolf roms rugs ruin rums rung runs sign silo sing slim slog slug slum slur smog smug snog snug soil soli song sori sorn soul sour sumo sung surf urns