Yes, dernier is in the scrabble dictionary

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Dernier Definition

adjective

Last; final.

from the GNU version of the Collaborative International Dictionary of English

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Top Words by points	Points
nerdier	8

2 letter words with DERNIER	Points
in	2
ed	3
en	2
er	2
de	3
id	3
ne	2
re	2

3 letter words with DERNIER	Points
nee	3
ire	3
ere	3
rid	4
rin	3
rei	3
err	3
ern	3
end	4
red	4
ree	3
dee	4
den	4
die	4
din	4

4 letter words with DERNIER	Points
dine	5
deer	5
nide	5
nerd	5
need	5
dene	5
deni	5
ired	5
dere	5
reed	5
dire	5
dree	5
rede	5
erne	4
eide	5
rind	5
ride	5
rend	5
rein	4

5 letter words with DERNIER	Points
rider	6
ender	6
erred	6
eider	6
drier	6
direr	6
diner	6
diene	6

6 letter words with DERNIER	Points
nereid	7
denier	7
reined	7
render	7

7 letter words with DERNIER	Points
nerdier	8
dernier	8

Found 56 words in 0.23581 seconds