We don't have synonyms for niopo yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are nopo, nipo and nippo.
(n) :
A kind of snuff prepared by some indigenous peoples of Venezuela and Colombia, from the roasted seeds of a leguminous tree, Anadenanthera peregrina.
(n) :
A kind of snuff prepared by some indigenous peoples of Venezuela and Colombia, from the roasted seeds of a leguminous tree, Anadenanthera peregrina.