Luxuriant =  strong in growth, abundant.

• The luxuriant vegetation of tropical region .
• Tall, luxuriant plants grew along the river bank.
• This area gets a lot of rain and covered with luxuriant forest.
• She had luxuriant hair which fell around her shoulders.
• This tree has wide-spreading branches and luxuriant foliage.

Luxurious = supplied with luxury, very  comfortable.

• She lived in luxurious surroundings.
• This  is a luxury hotel.
• They spent a luxurious weekend at the Kovalam beach.
• During the training programme , the company gave them luxurious accommodation.
• He is a person with luxurious tastes.
• He dreams of a highly paid job in order to lead a luxurious lifestyle.