Liliaceae vs liliaceous

Liliaceae is a noun but liliaceous is not a noun.

Word	Noun	Adjective	Verb	Adverb
Liliaceae	Yes	No	No	No
liliaceous	No	Yes	No	No

Liliaceae (noun)	liliaceous (noun)
includes species sometimes divided among the following families: Alliaceae, Aloeaceae, Alstroemeriaceae, Aphyllanthaceae, Asparagaceae, Asphodelaceae, Colchicaceae, Convallariaceae, Hemerocallidaceae, Hostaceae, Hyacinthaceae, Melanthiaceae, Ruscaceae, Smilacaceae, Tecophilaeacea, Xanthorrhoeaceae

Liliaceae (adjective)	liliaceous (adjective)
	of or pertaining to or characteristic of plants of the family Liliaceae