head trip vs self-gratification

head trip and self-gratification both are nouns.

Word	Noun	Adjective	Verb	Adverb
head trip	Yes	No	No	No
self-gratification	Yes	No	No	No

As nouns, head trip and self-gratification are synonyms defined as:

head trip and self-gratification: the act of satisfying your own desires and giving yourself pleasure

head trip (noun)	self-gratification (noun)
the act of satisfying your own desires and giving yourself pleasure	the act of satisfying your own desires and giving yourself pleasure
an exciting or stimulating experience	indiscipline with regard to sensuous pleasures