Yes, riant is in the scrabble dictionary

...and is worth 6 points by itself.

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Riant Definition

adjective

Cheerful; mirthful.

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

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Top Words by points	Points
riant	5

2 letter words with RIANT	Points
ta	2
ai	2
na	2
it	2
in	2
ti	2
at	2
ar	2
an	2

3 letter words with RIANT	Points
tan	3
tar	3
rai	3
rin	3
ria	3
rat	3
ran	3
tin	3
nit	3
art	3
ain	3
air	3
ait	3
ant	3
ani	3

4 letter words with RIANT	Points
anti	4
tian	4
tarn	4
tain	4
rant	4
rani	4
rain	4
airn	4
airt	4

5 letter words with RIANT	Points
riant	5
train	5

Found 35 words in 0.1486 seconds