Did I mention that I enjoy programming? :)

aged

argo

awed

dame

dare

dear

demo

doer

dome

dorm

drag

dram

draw

drew

ergo

game

gear

germ

goad

gore

grad

gram

grew

grow

made

mare

mead

meow

mode

more

ogre

owed

rage

read

ream

redo

road

roam

rode

wade

wage

ward

ware

warm

wear

word

wore 

worm

@Irem: I fail to find "i", "n", "p", "s" and "z" in "WORDGAME". Also, half of your words are longer than 4 letters =}

@Md Saifur Rahman: what's "gome"?

Oh sorry, i didn't get that.

Mage, worm, gome, mead, doge,

Dame

@James, that's quite possible, if not likely. The "dictionary" file that gets shipped with Ubuntu Linux doesn't have the entire corpus of the English Language as a basis =}

Are there any left?