Luxuriant vs Luxurious
Luxuriantadjective
produced or growing in extreme abundance
Luxuriousadjective
displaying luxury and furnishing gratification to the senses
The difference
Luxuriant means growing abundantly. Luxurious means expensively comfortable. Luxuriant hair; a luxurious hotel.
How to keep them apart
Luxuriant is about profusion, luxurious about expense. Vegetation is luxuriant; a suite is luxurious.