tripper vs user

tripper and user both are nouns.

Word	Noun	Adjective	Verb	Adverb
tripper	Yes	No	No	No
user	Yes	No	No	No

As nouns, user is a hypernym of tripper; that is, user is a word with a broader meaning than tripper:

tripper: (slang) someone who has taken a psychedelic drug and is undergoing hallucinations
user: a person who takes drugs

Other hypernyms of tripper include drug user, substance abuser.

tripper (noun)	user (noun)
a catch mechanism that acts as a switch	a person who makes use of a thing; someone who uses or employs something
a tourist who is visiting sights of interest	a person who uses something or someone selfishly or unethically
a walker or runner who trips and almost falls	a person who takes drugs
(slang) someone who has taken a psychedelic drug and is undergoing hallucinations