luxuriant vs lush

luxuriant is not a noun while lush is a noun.

Word	Noun	Adjective	Verb	Adverb
luxuriant	No	Yes	No	No
lush	Yes	Yes	No	No

As adjectives, luxuriant and lush are synonyms defined as:

Other synonyms of luxuriant include exuberant, profuse, riotous.

luxuriant (noun)	lush (noun)
	a person who drinks alcohol to excess habitually

luxuriant (adjective)	lush (adjective)
produced or growing in extreme abundance	produced or growing in extreme abundance
marked by complexity and richness of detail	tender and full of juice
displaying luxury and furnishing gratification to the senses	ostentatiously rich and superior in quality
	having strong sexual appeal