Words That Start With OO

3-Letter Words (3 found)

4-Letter Words (5 found)

5-Letter Words (6 found)

6-Letter Words (19 found)

7-Letter Words (19 found)

8-Letter Words (21 found)

9-Letter Words (10 found)

10-Letter Words (1 found)

12-Letter Words (1 found)

14-Letter Words (1 found)

The Merriam-Webster
Unabridged Dictionary

Online access to a
legendary resource
Log In or Sign Up »

Our Dictionary,
On Your Devices

Merriam-Webster,
With Voice Search
Get the Free Apps! »

The Official SCRABBLE^®
Players Dictionary

BAE, SPORK, and ZONKEY
join over 500 new words
added to the Seventh Edition.
Learn More »

Join Us

Merriam-Webster
on Twitter »

Merriam-Webster
on Facebook »

Merriam-Webster Shop

Dictionaries, thesauruses, and new reference books for kids. See all »

Other Merriam-Webster Dictionaries

Merriam-Webster.com » Webster's Unabridged Dictionary » Nglish - Spanish-English Translation »

Browse the SCRABBLE^® Dictionary

^® Merriam-Webster, Incorporated