phase in vs introduce

phase in and introduce both are verbs.

Word	Noun	Adjective	Verb	Adverb
phase in	No	No	Yes	No
introduce	No	No	Yes	No

As verbs, introduce is a hypernym of phase in; that is, introduce is a word with a broader meaning than phase in:

Other hypernyms of phase in include innovate.

phase in (verb)	introduce (verb)
introduce gradually	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