13 letter words:
reengineering15,
11 letter words:
engineering13,
10 letter words:
regreening12,
reengineer11,
8 letter words:
engining10,
greegree10,
greening10,
grinning10,
reigning10,
reneging10,
engineer9,
greenier9,
7 letter words:
ginning9,
girning9,
greeing9,
ringing9,
ginnier8,
greener8,
greenie8,
grinner8,
regreen8,
reining8,
reneger8,
rinning8,
6 letter words:
geeing8,
gieing8,
ginger8,
greige8,
grigri8,
nigger8,
rigger8,
engine7,
erring7,
ginner7,
inning7,
renege7,
ringer7,
eerier6,
rennin6,
5 letter words:
egger7,
genie6,
genii6,
genre6,
green6,
iring6,
reign6,
renig6,
rerig6,
eerie5,
inner5,
renin5,
4 letter words:
grig6,
eger5,
gene5,
gien5,
girn5,
gree5,
grin5,
ring5,
erne4,
nene4,
nine4,
rein4,
3 letter words:
egg5,
gig5,
igg5,
eng4,
erg4,
gee4,
gen4,
gie4,
gin4,
neg4,
reg4,
rig4,
ere3,
ern3,
err3,
inn3,
ire3,
nee3,
ree3,
rei3,
rin3,
2 letter words:
en2,
er2,
in2,
ne2,
re2,