is a specific kind of: drug.

is a broader term that covers: amphetamine, pep pill, speed, upper | analeptic | aphrodisiac | butyl nitrite, isobutyl nitrite | African tea, Arabian tea, cat, kat, khat, qat, quat | methylphenidate, Ritalin | popper.

derivation: arouse, brace, energise, energize, perk up, stimulate.