There are thousands of words which are 11 letters long and contain an O. Some quick examples include:
There are a number of websites specifically made for supplying you with a list of words that meet specific criteria like yours. For a complete list, you should visit one of the examples in the related links below.
10 letter words that start with the letter O:obedientlyobituariesobjectivesobligationobligatoryobliterateobservanceobstetricsobstructedoccasionaloccupationoccurrenceoceanfrontoceangoingofficiallyoftentimesoldfangledomnipotentoperationsoppositionoppressiveoptimisticoratoricalorchestrasordinarilyordinationoriginallyornamentalostensiblyostracizedoutfielderoutflankedoutlandishoutperformoutrageousoveractiveoverchargeoverturned
You don't. The letter O is a letter, not a word. The word "oh" is a word but it does not stand for the letter O.
toastmaster
There are many such words; blockbuster, bookshelves, choirmaster, doorstopper and doorknocker are some.
What is a seven letter word with o as the sixth letter
The second letter of the word zoom is an o.
EMOTION is the word.
orchestrate is an active word that begins with the letter O
Boorish is a 7 letter negative word. The 3rd letter is the letter o.
One-half is a hyphenated word. It begins with the letter O.
Blogger is a seven letter word that the 3rd letter is an O and the 4th letter is a G.
A five letter word with the third letter O and the last letter C is stoic.