Yes, mouse is in the scrabble dictionary

...and is worth 9 points by itself.

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Mouse Definition

noun

A cowardly or timid person.
from The American Heritage Dictionary of the English Language, 4th Edition
Any of numerous small rodents of the families Muridae and Cricetidae, such as the common house mouse (Mus musculus), characteristically having a pointed snout, small rounded ears, and a long naked or almost hairless tail.
from The American Heritage Dictionary of the English Language, 4th Edition
Any of various similar or related animals, such as the jumping mouse, the vole, or the jerboa.
from The American Heritage Dictionary of the English Language, 4th Edition
Computer Science A hand-held, button-activated input device that when rolled along a flat surface directs an indicator to move correspondingly about a computer screen, allowing the operator to move the indicator freely, as to select operations or manipulate text or graphics.
from The American Heritage Dictionary of the English Language, 4th Edition
Informal A discolored swelling under the eye caused by a blow; a black eye.
from The American Heritage Dictionary of the English Language, 4th Edition

verb-intransitive

To hunt mice.
from The American Heritage Dictionary of the English Language, 4th Edition
To search furtively for something; prowl.
from The American Heritage Dictionary of the English Language, 4th Edition

verb

To hunt for mice.
from Free Scrabble Dictionary
To search or move stealthily or slowly.
from Free Scrabble Dictionary
To toy with roughly.
from Free Scrabble Dictionary
To search for carefully .
from Free Scrabble Dictionary
(of a cat or owl) hunt for or catch mice:.
from Free Scrabble Dictionary

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Top Words by points

Points

mouse

7

2 letter words with MOUSE

Points

es

2

oe

2

om

4

os

2

so

2

mu

4

mo

4

me

4

um

4

us

2

em

4

3 letter words with MOUSE

Points

sum

5

sue

3

sou

3

som

5

ose

3

oms

5

oes

3

ums

5

use

3

mus

5

mos

5

emu

5

ems

5

emo

5

4 letter words with MOUSE

Points

muso

6

muse

6

moue

6

meou

6

emus

6

some

6

sumo

6

emos

6

5 letter words with MOUSE

Points

mouse

7

moues

7

meous

7

Found 36 words in 0.12915 seconds