Yes, noesis is in the scrabble dictionary

...and is worth 7 points by itself.

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Noesis Definition

noun

The cognitive process; cognition.

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

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Top Words by points	Points
sonsie	6

2 letter words with NOESIS	Points
es	2
so	2
si	2
os	2
on	2
oi	2
oe	2
no	2
ne	2
is	2
in	2
en	2

3 letter words with NOESIS	Points
eon	3
sos	3
son	3
sis	3
sin	3
sen	3
sei	3
ens	3
ose	3
ons	3
one	3
oes	3
ess	3
ins	3
ion	3
nos	3

4 letter words with NOESIS	Points
sins	4
sine	4
seis	4
ions	4
ness	4
noes	4
oses	4
ones	4
nose	4
sons	4
sone	4
eons	4

5 letter words with NOESIS	Points
eosin	5
noise	5
sines	5
sones	5
noses	5

6 letter words with NOESIS	Points
sonsie	6
ossein	6
noises	6
noesis	6
enosis	6
eosins	6
essoin	6

Found 52 words in 0.19211 seconds