substantial vs rich

substantial is not a noun while rich is a noun.

Word	Noun	Adjective	Verb	Adverb
substantial	No	Yes	No	No
rich	Yes	Yes	No	No

substantial (noun)	rich (noun)
	people who have possessions and wealth (considered as a group)

substantial (adjective)	rich (adjective)
having substance or capable of being treated as fact; not imaginary	possessing material wealth
of considerable importance, size, or worth	having an abundant supply of desirable qualities or substances (especially natural resources)
of or relating to the real nature or essential elements of something	suggestive of or characterized by great expense
having an abundant supply of money or possessions of value	high in mineral content; having a high proportion of fuel to air
of good quality and condition; solidly built	causing indignation due to hypocrisy
providing abundant nourishment	affording an abundant supply
	strong; intense
	marked by great fruitfulness
	pleasantly full and mellow
	marked by richness and fullness of flavor
	containing plenty of fat, or eggs, or sugar
	of great worth or quality
	very productive