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Oo vs Oh - What's the difference?

oo | oh |

As nouns the difference between oo and oh

is that oo is the Greek letter omega while oh is the letter O, o (more commonly spelled o.

As an abbreviation OH is

ohio, a state of the United States of America.

As an interjection oh is

expression of surprise.

As a verb oh is

to utter the interjection oh; to express surprise, etc.

oo

English

(wikipedia oo)

Etymology 1

Representation of a long-o sound.

Noun

(en noun)
  • (obsolete) The Greek letter omega.

    • Etymology 2

    (Moho) From (etyl) , resembling its call.

    Noun

    (en noun)
  • A Hawaiian bird of the genus Moho , formerly classed with the honeyeaters and now believed to be extinct.
    • English palindromes English two-letter words ----

    oh

    English

    Abbreviation

    (Abbreviation) (head)
  • (US) Ohio, a state of the United States of America.
  • (organic chemistry) Symbol for a hydroxyl, or alcohol, functional group.
  • (inorganic chemistry) Symbol for a hydroxide radical, or hydroxyl group.
  • (US, army, aviation) Prefix code for observation helicopter designations.
  • (Internet slang) Other half, i.e., husband, wife, partner, etc.