Analeptic and Upper

Analeptic noun - A medication used as a stimulant to the central nervous system.

Upper and analeptic are semantically related. in stimulant topic. In some cases you can use "Upper" instead a noun "Analeptic", when it comes to topics like substance that invigorates, hard drug, pill with stimulant.

Upper noun - The higher of two berths.

Analeptic and upper are semantically related. You can use "Analeptic" instead a noun "Upper".