Yes, runlet is in the scrabble dictionary

...and is worth 9 points by itself.

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Runlet Definition

noun

A rivulet.

from The American Heritage Dictionary of the English Language, 4th Edition

A small stream.

from Free Scrabble Dictionary

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Here are some other words you could make with the letters RUNLET, you can also
use this lookup tool to help you find words with our scrabble word finder.

Top Words by points	Points
runlet	6

2 letter words with RUNLET	Points
en	2
re	2
nu	2
ne	2
el	2
te	2
un	2
ut	2
et	2
er	2

3 letter words with RUNLET	Points
tun	3
ten	3
tel	3
urn	3
rut	3
ute	3
rue	3
ret	3
run	3
nut	3
net	3
ern	3
let	3
leu	3
lun	3

4 letter words with RUNLET	Points
lune	4
turn	4
tune	4
tule	4
true	4
tern	4
lent	4
nurl	4
lunt	4
lure	4
runt	4
rune	4
rule	4
rent	4
lute	4

5 letter words with RUNLET	Points
tuner	5
lunet	5
unlet	5

6 letter words with RUNLET	Points
runlet	6

Found 44 words in 0.19474 seconds