Aloe and Century plant

Aloe noun - Succulent plants having rosettes of leaves usually with fiber like hemp and spikes of showy flowers; found chiefly in Africa.

Century plant and aloe are semantically related. In some cases you can use "Century plant" instead a noun "Aloe".

Century plant noun - Tropical American plants with basal rosettes of fibrous sword-shaped leaves and flowers in tall spikes; some cultivated for ornament or for fiber.

Aloe and century plant are semantically related. You can use "Aloe" instead a noun phrase "Century plant".