hallucinative

As an adjective psychedelic is

of, containing, generating, or reminiscent of drug-induced hallucinations, distortions of perception, altered awareness etc.

As a noun psychedelic is

any psychoactive substance (such as lsd or psilocybin) which, when consumed]], causes [[perception|perceptual changes (sometimes erratic and uncontrollable), visual hallucination, and altered awareness of the body and mind.

As an interjection psychedelic is

awesome, cool, groovy.

Hallucinative is likely misspelled.

Hallucinative has no English definition.

As a noun taxonomy

is the science or the technique used to make a classification.