introductory vs introduce

introductory is an adjective but introduce is not an adjective.

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

introductory (adjective)	introduce (adjective)
serving as a base or starting point
serving to open or begin
serving as an introduction or preface

introductory (verb)	introduce (verb)
	be a precursor of
	place, fit, or thrust (something) into another thing
	put before (a body)
	cause to come to know personally
	furnish with a preface or introduction
	bring before the public for the first time, as of an actor, song, etc.
	put or introduce into something
	bring something new to an environment
	bring in or establish in a new place or environment
	bring in a new person or object into a familiar environment