off-white vs ivory

off-white and ivory both are nouns.

Word	Noun	Adjective	Verb	Adverb
off-white	Yes	Yes	No	No
ivory	Yes	No	No	No

As nouns, off-white and ivory are synonyms defined as:

Other synonyms of off-white include bone, pearl.

off-white (noun)	ivory (noun)
a shade of white the color of bleached bones	a shade of white the color of bleached bones
	a hard smooth ivory colored dentine that makes up most of the tusks of elephants and walruses

off-white (adjective)	ivory (adjective)
of something having a color tending toward white