Yes, undoer is in the scrabble dictionary

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Undoer Definition

noun

Agent noun of Xyzy}}; one who undoes.
from the English-language Wiktionary

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Top Words by points

Points

enduro

7

2 letter words with UNDOER

Points

do

3

un

2

re

2

or

2

on

2

oe

2

od

3

nu

2

no

2

ne

2

er

2

en

2

ed

3

de

3

3 letter words with UNDOER

Points

den

4

doe

4

don

4

dor

4

due

4

ode

4

one

3

ore

3

oud

4

our

3

nor

3

nod

4

dun

4

duo

4

red

4

rod

4

ern

3

eon

3

end

4

udo

4

urd

4

urn

3

roe

3

rue

3

run

3

4 letter words with UNDOER

Points

rode

5

redo

5

rend

5

reno

4

dure

5

roue

4

rude

5

rued

5

rune

4

udon

5

unde

5

undo

5

nurd

5

nude

5

node

5

nerd

5

doer

5

euro

4

dune

5

durn

5

duro

5

done

5

dore

5

dour

5

5 letter words with UNDOER

Points

round

6

uredo

6

under

6

drone

6

nuder

6

rouen

5

ronde

6

redon

6

6 letter words with UNDOER

Points

enduro

7

undoer

7

Found 73 words in 0.16696 seconds