Yes, tighten is in the scrabble dictionary

...and is worth 12 points by itself.

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Tighten Definition

verb-transitive

To make or become tight or tighter.
from The American Heritage Dictionary of the English Language, 4th Edition

verb

To make or .
from Free Scrabble Dictionary
To become tight or tighter.
from Free Scrabble Dictionary

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Top Words by points

Points

tighten

11

2 letter words with TIGHTEN

Points

ti

2

in

2

it

2

ne

2

hi

5

he

5

eh

5

te

2

gi

3

et

2

en

2

3 letter words with TIGHTEN

Points

tet

3

ten

3

teg

4

nth

6

the

6

nit

3

net

3

tie

3

tin

3

neg

4

tit

3

hit

6

gen

4

get

4

ghi

7

gie

4

gin

4

git

4

eth

6

eng

4

hen

6

het

6

hie

6

hin

6

4 letter words with TIGHTEN

Points

thin

7

then

7

teth

7

tent

4

tein

4

tine

4

ting

5

tint

4

hent

7

nite

4

nigh

8

nett

4

gent

5

gien

5

gite

5

hint

7

5 letter words with TIGHTEN

Points

night

9

tithe

8

tinge

6

tight

9

thing

9

thine

8

thein

8

thegn

9

tenth

8

hinge

9

neigh

9

eight

9

7 letter words with TIGHTEN

Points

tighten

11

Found 64 words in 0.22192 seconds