neuroleptic agent vs antipsychotic drug

neuroleptic agent and antipsychotic drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
neuroleptic agent	Yes	No	No	No
antipsychotic drug	Yes	No	No	No

As nouns, neuroleptic agent and antipsychotic drug are synonyms defined as:

neuroleptic agent and antipsychotic drug: tranquilizer used to treat psychotic conditions when a calming effect is desired

neuroleptic agent (noun)	antipsychotic drug (noun)
tranquilizer used to treat psychotic conditions when a calming effect is desired	tranquilizer used to treat psychotic conditions when a calming effect is desired