neuroleptic vs tranquilliser

neuroleptic and tranquilliser both are nouns.

Word	Noun	Adjective	Verb	Adverb
neuroleptic	Yes	No	No	No
tranquilliser	Yes	No	No	No

As nouns, tranquilliser is a hypernym of neuroleptic; that is, tranquilliser is a word with a broader meaning than neuroleptic:

neuroleptic: tranquilizer used to treat psychotic conditions when a calming effect is desired
tranquilliser: a drug used to reduce stress or tension without reducing mental clarity

neuroleptic (noun)	tranquilliser (noun)
tranquilizer used to treat psychotic conditions when a calming effect is desired	a drug used to reduce stress or tension without reducing mental clarity