corundum

1. An extremely hard mineral, aluminum oxide, Al2O3, sometimes containing iron, magnesia, or silica, that occurs in gem varieties such as ruby and sapphire and in a common black, brown, or blue form used chiefly in abrasives.

2. A very hard mineral that consists of aluminum oxide occurring in massive and crystalline forms, that can be synthesized, and that is used for gemstones (as ruby and sapphire) and as an abrasive.

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Top Words by points	Points	Word Game
corundum	13	Scrabble

2 Letters	Scrabble® Points
om	4
mo	4
mu	4
no	2
nu	2
od	3
do	3
on	2
or	2
um	4
un	2

3 Letters	Scrabble® Points
nom	5
urn	3
urd	4
moc	7
mod	6
mon	5
mor	5
mud	6
mun	5
udo	4
nod	4
rod	4
nor	3
run	3
con	5
rum	5
rom	5
orc	5
oud	4
our	3
roc	5
doc	6
cod	6
cor	5
cru	5
cud	6
duo	4
cum	7
cur	5
dom	6
don	4
dor	4
dum	6
dun	4

4 Letters	Scrabble® Points
cord	7
curn	6
curd	7
crud	7
corn	6
corm	8
nurd	5
udon	5
unco	6
undo	5
duro	5
durn	5
drum	7
dour	5
norm	6
doum	7
dorm	7
morn	6
muon	6

5 Letters	Scrabble® Points
duroc	8
round	6
mound	8
mourn	7
mucor	9
mucro	9
durum	8
cornu	7
crudo	8

6 Letters	Scrabble® Points
cundum	11

8 Letters	Scrabble® Points
corundum	13