rubberneck vs tripper

rubberneck and tripper both are nouns.

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

As nouns, rubberneck and tripper are synonyms defined as:

Other synonyms of rubberneck include excursionist, sightseer.

rubberneck (noun)	tripper (noun)
a person who stares inquisitively	a catch mechanism that acts as a switch
a tourist who is visiting sights of interest	a tourist who is visiting sights of interest
	a walker or runner who trips and almost falls
	(slang) someone who has taken a psychedelic drug and is undergoing hallucinations

rubberneck (verb)	tripper (verb)
strain to watch; stare curiously