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Puke
Slang Warning
Avoid 'puke' in formal situations; it's considered slang and can be rude or unprofessional. 
Harsh Sound
'Puke' may sound harsh; it has a stronger emotional impact than 'vomit', expressing disgust or revulsion. 
Humorous Use
Sometimes used for humor in casual conversation, lightening the unpleasantness of the situation. 