riotous vs lush

riotous is not a noun while lush is a noun.

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

As adjectives, riotous and lush are synonyms defined as:

Other synonyms of riotous include exuberant, luxuriant, profuse.

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

riotous (adjective)	lush (adjective)
produced or growing in extreme abundance	produced or growing in extreme abundance
unrestrained by convention or morality	tender and full of juice
characterized by unrest or disorder or insubordination	ostentatiously rich and superior in quality
	having strong sexual appeal