Yes, yourn is in the scrabble dictionary

...and is worth 9 points by itself.

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Yourn Definition

pronoun

Yours.

from the English-language Wiktionary

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Here are some other words you could make with the letters YOURN, you can also
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Top Words by points	Points
yourn	8

2 letter words with YOURN	Points
no	2
nu	2
on	2
or	2
oy	5
un	2
yo	5

3 letter words with YOURN	Points
nor	3
our	3
run	3
ryu	6
urn	3
yon	6
you	6

4 letter words with YOURN	Points
your	7

5 letter words with YOURN	Points
yourn	8

Found 16 words in 0.12871 seconds