Yes, rills is in the scrabble dictionary

...and is worth 7 points by itself.

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Rills Definition

noun

Plural form of rill.

from the English-language Wiktionary

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Here are some other words you could make with the letters RILLS, you can also
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Top Words by points	Points
rills	5

2 letter words with RILLS	Points
is	2
li	2
si	2

3 letter words with RILLS	Points
ill	3
lis	3
sir	3
sri	3

4 letter words with RILLS	Points
ills	4
rill	4
sill	4

5 letter words with RILLS	Points
rills	5

Found 11 words in 0.16633 seconds