Yes, rat is in the scrabble dictionary
...and is worth 3 points by itself.
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Rat Definition noun
Any of various animals similar to one of these long-tailed rodents .
from The American Heritage Dictionary of the English Language, 4th Edition
Any of various long-tailed rodents resembling mice but larger, especially one of the genus Rattus .
from The American Heritage Dictionary of the English Language, 4th Edition
Slang A despicable person, especially one who betrays or informs upon associates .
from The American Heritage Dictionary of the English Language, 4th Edition
Slang A scab laborer .
from The American Heritage Dictionary of the English Language, 4th Edition
Any of numerous rodents ( and related genera) differing from the related mice especially by considerably larger size .
from Free Scrabble Dictionary
verb-intransitive
Slang To work as a scab laborer .
from The American Heritage Dictionary of the English Language, 4th Edition
To hunt for or catch rats, especially with the aid of dogs .
from The American Heritage Dictionary of the English Language, 4th Edition
verb-transitive
To puff out (the hair) with or as if with a pad of material .
from The American Heritage Dictionary of the English Language, 4th Edition
verb
To betray, desert, or inform on one's associates .
from Free Scrabble Dictionary
To catch or hunt rats .
from Free Scrabble Dictionary
To work as a scab .
from Free Scrabble Dictionary
To give (hair) the effect of greater quantity (as by use of a rat) .
from Free Scrabble Dictionary
To inform on .
from Free Scrabble Dictionary
Here are some other words you could make with the letters RAT , you can also use this lookup tool to help you find words with our scrabble word finder .
Top Words by points
Points
art
3
2 letter words with RAT Points ar 2 at 2 ta 2
3 letter words with RAT Points art 3 rat 3 tar 3
Found 6 words in 0.10233 seconds