BehaveNet needs help with terms and definitions

Psychostimulant, analeptic, stimulant, CNS stimulant, wakefulness promoting: Are they all synonyms? If not, what might distinguish one from another? Would you classify the same group of drugs in all of them?
Anorectic, anorexiant, anorexigenic: same questions
Hypnotic, soporific: any difference?

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