For me, the naut bit isn't much better. Nauts are a bit of a let-down, and perhaps a bit of a con. I mean, astronauts don't really explore the stars, do they, nor an aeronaut the air...
...and to me it all reeks rather of marketing.
So what is a psychonaut, anyway? It's someone who willingly puts his or her mind in an unusual environment and then sees how it reacts.
The unusual environment may involve hypnosis, trances, drugs, mental or physical deprivation, repetition, or dreaming.
Of course this sort of thing has a very long and even, in parts, respectable history.
But psychonaut still sounds too much like a desperate attempt to sell a children's cartoon, to me.
Sunday Rest: psychonaut. This word comes from the Greek psychē, soul, spirit or mind, and naútēs, sailor or navigator. Psychonaut seems to have been coined by Ernst Jünger, who used the term in a 1970 essay.