Yes, heir is in the scrabble dictionary

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Heir Definition

noun

A person who inherits or is entitled by law or by the terms of a will to inherit the estate of another.
from The American Heritage Dictionary of the English Language, 4th Edition
A person who succeeds or is in line to succeed to a hereditary rank, title, or office.
from The American Heritage Dictionary of the English Language, 4th Edition
One who receives or is expected to receive a heritage, as of ideas, from a predecessor.
from The American Heritage Dictionary of the English Language, 4th Edition
One who inherits or is entitled to inherit property.
from Free Scrabble Dictionary
One who inherits or is entitled to succeed to a hereditary rank, title, or office.
from Free Scrabble Dictionary

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Top Words by points

Points

heir

7

2 letter words with HEIR

Points

eh

5

er

2

he

5

hi

5

re

2

3 letter words with HEIR

Points

her

6

hie

6

ire

3

rei

3

4 letter words with HEIR

Points

heir

7

hire

7

Found 11 words in 0.12512 seconds