There is no exact number that I can think of, but I'll give you some examples: field, wed, red, oil, foil, fed, rod, low, if, rid, etc... It also depends on wether or not you are allowed to use the same letters more than once...Ex: will, fill, door, feed, etc...
Words that you can spell with 'duoo' are do and duo.
England!
Some words that can be spelled with D U M O N are:dodondunduomodMon.moundmudnonodon
wilt and pod
Aplyrcde
113 words, easy
Eldest
donchasse: french for something
Cred, cry.
The letters can be used to spell the 7 letter words hastate (triangular) and quashed (to suppress completely). They also can be used to spell the words swathed and swatted.
88.fruitedriftedturfeddriftfetidfiredfriedfruitrefittiredtriedtrueduteridefideftdietdiredirtditeduetduitdureeditetuifeudfirefretfritiredreftreifrideriferiftriteruderuedtidetiedtiertiretreftrueturdturfdefdiedifditdueduieftfedferfetfeufidfiefirfitfudfurireredrefreiretridrifrueruttedtietuiurdutedeedeferetfeidifitretiut
wogo