Yes, sizes is in the scrabble dictionary

...and is worth 14 points by itself.

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Sizes Definition

noun

Plural form of size.
from the English-language Wiktionary

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Top Words by points

Points

sizes

14

2 letter words with SIZES

Points

es

2

is

2

si

2

3 letter words with SIZES

Points

ess

3

sei

3

sis

3

4 letter words with SIZES

Points

seis

4

size

13

5 letter words with SIZES

Points

sizes

14

Found 9 words in 0.14643 seconds