Yes, unnail is in the scrabble dictionary

...and is worth 10 points by itself.

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Unnail Definition

verb-transitive

To remove the nails from; to unfasten by removing nails.
from the GNU version of the Collaborative International Dictionary of English

verb

To unfasten by removing nails.
from Free Scrabble Dictionary

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Top Words by points

Points

annuli

6

2 letter words with UNNAIL

Points

al

2

nu

2

na

2

un

2

ai

2

li

2

la

2

in

2

an

2

3 letter words with UNNAIL

Points

inn

3

ani

3

lin

3

lun

3

ain

3

uni

3

ail

3

nan

3

nil

3

nun

3

4 letter words with UNNAIL

Points

ulan

4

ulna

4

unai

4

lain

4

nail

4

luna

4

linn

4

anil

4

5 letter words with UNNAIL

Points

annul

5

6 letter words with UNNAIL

Points

annuli

6

unnail

6

Found 30 words in 0.17869 seconds