initiative vs inaugural

initiative and inaugural both are nouns.

Word	Noun	Adjective	Verb	Adverb
initiative	Yes	Yes	No	No
inaugural	Yes	Yes	No	No

As adjectives, initiative and inaugural are synonyms defined as:

Other synonyms of initiative include first, initiatory, maiden.

initiative (noun)	inaugural (noun)
the first of a series of actions	the ceremonial induction into a position
readiness to embark on bold new ventures	an address delivered at an inaugural ceremony (especially by a United States president)

initiative (adjective)	inaugural (adjective)
serving to set in motion	occurring at or characteristic of a formal investiture or induction
	serving to set in motion