great vs of import

great is a noun but of import is not a noun.

Word	Noun	Adjective	Verb	Adverb
great	Yes	Yes	No	No
of import	No	Yes	No	No

great (noun)	of import (noun)
a person who has achieved distinction and honor in some field

great (adjective)	of import (adjective)
excellent	of great significance or value
in an advanced stage of pregnancy
uppercase
remarkable or out of the ordinary in degree or magnitude or effect
of major significance or importance
relatively large in size or number or extent; larger than others of its kind