Yes, sinew is in the scrabble dictionary

...and is worth 9 points by itself.

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Sinew Definition

noun

A tendon.
from The American Heritage Dictionary of the English Language, 4th Edition
The source or mainstay of vitality and strength. Often used in the plural: "Good company and good discourse are the very sinews of virtueā€¯ ( Izaak Walton).
from The American Heritage Dictionary of the English Language, 4th Edition
Vigorous strength; muscular power.
from The American Heritage Dictionary of the English Language, 4th Edition
One dressed for use as a cord or thread.
from Free Scrabble Dictionary
Solid resilient strength .
from Free Scrabble Dictionary

verb-transitive

To strengthen with or as if with sinews.
from The American Heritage Dictionary of the English Language, 4th Edition

verb

To strengthen as if with .
from Free Scrabble Dictionary

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Top Words by points

Points

sinew

8

2 letter words with SINEW

Points

es

2

ew

5

in

2

is

2

ne

2

we

5

si

2

en

2

3 letter words with SINEW

Points

sin

3

wis

6

win

6

wen

6

sew

6

sen

3

sei

3

new

6

ins

3

ens

3

4 letter words with SINEW

Points

sewn

7

sine

4

news

7

wens

7

wine

7

wins

7

wise

7

5 letter words with SINEW

Points

sinew

8

swine

8

wines

8

Found 28 words in 0.13724 seconds