| Alb. | fläter, fletë | wing, leaf |
| Alb.: Mandres | platár | wing |
| Alb.: geg | fluter, flutra | to fly |
| Alb. | fluturáj | to fly |
| Alb. | flytyrin | flight |
| Alb. | fluture | butterfly |
| Alb. | fluturák | chick; flying |
| Alb. | fluturim | flying swiftly away |
| Alb. | fluturídhë | nimble, fast |
| Roman. | fluture | butterfly |
| Roman. | flitura | to flap wings |
| Roman. | flutura | to flutter |
| Roman. | fluturas | Snipe, 194; Ringed Plover, 163 |
| Ital.reg. | flutur | butterfly |
| Franç. | flot | wave |
| Franç. | flotter | to float, etc. |
| Franç. | flottant | free, scattered, fickle, etc. |
| Franç. | fluter | (argot des étudiants) manquer un cours |
| Span. | fletar | to rub |
| Germ.reg. | flitschvögelche | Wren, 406 |
| Germ.reg. | flitschermaus | bat |
| Engl. | flit | to flutter; move rapidly; Swift, 321 |
| Engl. | flutter, flitter | to flutter |
| Engl.reg. | flutterer | Kestrel, 234 |
| Engl.reg. | hatter-flitter | Snipe, 194 |
| Engl. | fluttermouse | bat, 16.2 |
| Dutch | vleermus | bat, 16.2 |
| Germ. | fledermaus | bat, 16.2 |
| Germ.reg. | pluddermaus | bat, 16.2 |
| Germ. | flattern | to flutter |
| Germ.reg. | nachtfalter | attributed to "Nightjar", 251, but prob. = moth, cf. following |
| Germ.reg. | falter, folter | butterfly |
| Germ.(OHG) | fifalter | butterfly |
| Anc.Greek | epiáltès | butterfly, ghost |
| Anc.Greek | ephialtès | a pernicious giant, evil spirit |
| Gael.I. | fáltóg | Swallow, 316 |
| Franç. | flatter | to flatter |
| Franç.: Dol | flatin | flamme, FEW 23: 48 |
| Engl. | flaunt | flourish, vaunt etc. ("of obscure orig.") |
| Engl. | flounder | struggle in an akward manner (not a hybrid founder and blunder or flounce and founder !) |
| Engl. | flint | a hard stone used to ignite a fire: by rubbing of hitting (semantic relation to plinth) |
| Franç., Span. | flan | a dessert with gelatinous consistance |
| Engl. | flawn | (just the Engl. pronounciation of Span. flan) (not related to germ. fladen "flat cake"; a flawn is not a cake and is not flat) |
| Franç. | flâner | to stroll, French vagabonderð6.2.25.; se balladerð6.2.21. |
| Franç.: Tourcoing | floénier | trembler, FEW 21: 361 |
| Ital.: Romg. | fleina | Lapwing, 158 |