import vs substance

import and substance both are nouns.

Word	Noun	Adjective	Verb	Adverb
import	Yes	No	Yes	No
substance	Yes	No	No	No

As nouns, substance is a hypernym of import; that is, substance is a word with a broader meaning than import:

Other hypernyms of import include meaning.

As nouns, substance is a hypernym of import; that is, substance is a word with a broader meaning than import:

Other hypernyms of import include content, message, subject matter.

import (noun)	substance (noun)
commodities (goods or services) bought from a foreign country	the real physical matter of which a person or thing consists
having important effects or influence	a particular kind or species of matter with uniform properties
a meaning that is not expressly stated but can be inferred	the property of holding together and retaining its shape
the message that is intended or expressed or signified	the idea that is intended
an imported person brought from a foreign country	the choicest or most essential or most vital part of some idea or experience
	content communicating a message; what something is about
	considerable capital (wealth or income)
	material of a particular kind or constitution

import (verb)	substance (verb)
indicate or signify
bring in from abroad
transfer (electronic data) into a database or document