We don't have synonyms for nootropic yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are isotropic, eolotropic and notropis.
(n) :
(medicine) Any substance purported to increase or enhance cognitive abilities.
(n) :
(pharmacology) A drug that enhances learning and memory and lacks the usual pharmacology of other psychotropic drugs (e.g. sedation, motor stimulation) and possesses very few side effects and extremely low toxicity.
(adj) :
Relating to substances that enhance cognitive performance.
(n) :
(medicine) Any substance purported to increase or enhance cognitive abilities.
(n) :
(pharmacology) A drug that enhances learning and memory and lacks the usual pharmacology of other psychotropic drugs (e.g. sedation, motor stimulation) and possesses very few side effects and extremely low toxicity.
(adj) :
Relating to substances that enhance cognitive performance.