locknut

1. A self-locking nut.

2. A usually thin nut screwed down on another nut to prevent it from loosening.

3. A nut screwed down hard on another to prevent it from slacking back.

4. A nut so constructed that it itself when screwed tight against another part.

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Here are some other words you could make with the letters locknut, you can also
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Top Words by points	Points	Word Game
locknut	13	Scrabble

2 Letters	Scrabble® Points
to	2
nu	2
no	2
ok	6
on	2
lo	2
un	2
ut	2

3 Letters	Scrabble® Points
lot	3
con	5
cot	5
not	3
nut	3
col	5
cut	5
lun	3
out	3
ton	3
tun	3

4 Letters	Scrabble® Points
unco	6
unto	4
lunk	8
nock	10
tock	10
tolu	4
tuck	10
lunt	4
luck	10
lout	4
lock	10
clon	6
knot	8
clot	6
colt	6
conk	10
cult	6

5 Letters	Scrabble® Points
clunk	11
clonk	11
clout	7
count	7
knout	9

6 Letters	Scrabble® Points
unlock	12

7 Letters	Scrabble® Points
locknut	13