introductory vs basic

introductory is not a noun while basic is a noun.

Word	Noun	Adjective	Verb	Adverb
introductory	No	Yes	No	No
basic	Yes	Yes	No	No

As adjectives, introductory and basic are synonyms defined as:

introductory (noun)	basic (noun)
	(usually in the plural) a necessary commodity for which demand is constant

introductory (adjective)	basic (adjective)
serving as a base or starting point	pertaining to or constituting a base or basis
serving to open or begin	of or denoting or of the nature of or containing a base
serving as an introduction or preface	reduced to the simplest and most significant form possible without loss of generality
	serving as a base or starting point