Psychedelic drug and Psychoactive substance

Psychedelic drug noun - A psychoactive drug that induces hallucinations or altered sensory experiences.

Psychoactive substance and psychedelic drug are semantically related. In some cases you can use "Psychoactive substance" instead a noun phrase "Psychedelic drug".

Psychoactive substance noun - A drug that can produce mood changes and distorted perceptions.

Psychedelic drug and psychoactive substance are semantically related. Sometimes you can replace phrase "Psychedelic drug" with "Psychoactive substance", this phrases are similar.