Yes, ruder is in the scrabble dictionary

...and is worth 7 points by itself.

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Ruder Definition

adjective

Comparative form of rude.

from the English-language Wiktionary

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Here are some other words you could make with the letters RUDER, you can also
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Top Words by points	Points
ruder	6

2 letter words with RUDER	Points
de	3
ed	3
er	2
re	2

3 letter words with RUDER	Points
due	4
err	3
red	4
rue	3
urd	4

4 letter words with RUDER	Points
dure	5
durr	5
rude	5
rued	5
ruer	4

5 letter words with RUDER	Points
ruder	6

Found 15 words in 0.1329 seconds