What is one word that can be used to describe someone who likes to party and go to clubs?
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In addition to Edwin Ashworth's excellent suggestions of socialite and party animal I can make a few suggestions.
All of these uses are slang/idiomatic hence they might be readily available in a thesaurus or standard reference.
Partier (alternatively partyer) - usually a negative connotation.
(Note - the proper usage of this term is to describe a party attendee. This usage is slangy.)
Clubber - similar to partier.
(Note - the proper usage of this term is to describe someone wielding a club, typically to beat something like a baby seal to death.)
Also, an old-fashioned term: Good Time Charlie
I think this usage is quite antiquated, but it remains useful.