A person who attends rave parties, or who belongs to that subculture.(noun)
A person who raves or rants.(noun)
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Use "raver" in a sentence
"Now is probably a good time to admit that I myself am a reformed/recovering ranter and raver, which is why I feel compelled to tell everyone else to stop it."
"A rave (or rave-up) was a crazy party, and a raver was a party animal."
"Drugscope found the use of ketamine - also called raver's smack - was on the rise in nine out of 20 areas it surveyed around the country."