Yes, cuber is in the scrabble dictionary

...and is worth 12 points by itself.

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Cuber Definition

noun

Any device designed to cut things into cubes.
from the English-language Wiktionary

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Top Words by points

Points

cuber

9

2 letter words with CUBER

Points

be

4

re

2

er

2

3 letter words with CUBER

Points

urb

5

rue

3

rub

5

rec

5

reb

5

ecu

5

cur

5

cue

5

cub

7

cru

5

bur

5

4 letter words with CUBER

Points

cure

6

curb

8

ecru

6

cube

8

rube

6

5 letter words with CUBER

Points

cuber

9

Found 20 words in 0.12952 seconds