Yes, ace is in the scrabble dictionary

...and is worth 6 points by itself.

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Ace Definition

noun

A military aircraft pilot who has destroyed five or more enemy aircraft.
from The American Heritage Dictionary of the English Language, 4th Edition
A playing card, die, or domino having one spot or pip.
from The American Heritage Dictionary of the English Language, 4th Edition
A point scored by such a serve.
from The American Heritage Dictionary of the English Language, 4th Edition
A single spot or pip on a playing card, die, or domino.
from The American Heritage Dictionary of the English Language, 4th Edition
An expert in a given field.
from The American Heritage Dictionary of the English Language, 4th Edition

idiom

In the hole A hidden advantage or resource kept in reserve until needed.
from The American Heritage Dictionary of the English Language, 4th Edition
Within an ace of On the verge of; very near to: came within an ace of losing the election.
from The American Heritage Dictionary of the English Language, 4th Edition

verb-transitive

Slang To get the better of (someone): a candidate who aced his opponents in the primaries.
from The American Heritage Dictionary of the English Language, 4th Edition
Slang To perform with distinction on: aced the interview.
from The American Heritage Dictionary of the English Language, 4th Edition
Slang To receive a grade of A on: She aced the exam.
from The American Heritage Dictionary of the English Language, 4th Edition
To hit an ace on (a hole) in golf.
from The American Heritage Dictionary of the English Language, 4th Edition
To serve an ace against in racket games.
from The American Heritage Dictionary of the English Language, 4th Edition

adjective

Top-notch; first-rate.
from The American Heritage Dictionary of the English Language, 4th Edition
Of first or high rank or quality .
from Free Scrabble Dictionary

abbreviation

American Council on Education.
from Free Scrabble Dictionary

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Top Words by points

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ace

5

2 letter words with ACE

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ae

2

3 letter words with ACE

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ace

5

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