truth drug vs truth serum

truth drug and truth serum both are nouns.

Word	Noun	Adjective	Verb	Adverb
truth drug	Yes	No	No	No
truth serum	Yes	No	No	No

As nouns, truth drug and truth serum are synonyms defined as:

truth drug and truth serum: an intravenous anesthetic drug that has a hypnotic effect; induces relaxation and weakens inhibitions; is believed to induce people to talk freely

truth drug (noun)	truth serum (noun)
an intravenous anesthetic drug that has a hypnotic effect; induces relaxation and weakens inhibitions; is believed to induce people to talk freely	an intravenous anesthetic drug that has a hypnotic effect; induces relaxation and weakens inhibitions; is believed to induce people to talk freely