antipsychotic vs tranquillizer

antipsychotic and tranquillizer both are nouns.

Word	Noun	Adjective	Verb	Adverb
antipsychotic	Yes	No	No	No
tranquillizer	Yes	No	No	No

As nouns, tranquillizer is a hypernym of antipsychotic; that is, tranquillizer is a word with a broader meaning than antipsychotic:

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

antipsychotic (noun)	tranquillizer (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