of import vs significant

of import and significant both are adjectives.

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

of import (adjective)	significant (adjective)
of great significance or value	important in effect or meaning
	too closely correlated to be attributed to chance and therefore indicating a systematic relation
	of considerable importance, size, or worth
	rich in significance or implication