The word "whoops" is an interjection. It’s similar to "wow," "hey," and "no." (An interjection is almost always just one word.) Interjections can be used alone or as part of a sentence, but they stand out from the other parts of speech because a person chooses an interjection based entirely on the situation he or she might be in.
You’ll also hear some people say "whoopsy" or "whoopsy daisy," especially when talking with children.
Whoops! Someone didn’t pack his parachute.
Don’t worry! He has a reserve chute.
Note: This word is similar to "oops."
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September 6, 2014