startup vs inauguration

startup and inauguration both are nouns.

Word	Noun	Adjective	Verb	Adverb
startup	Yes	No	No	No
inauguration	Yes	No	No	No

As nouns, startup and inauguration are synonyms defined as:

startup and inauguration: the act of starting a new operation or practice

startup (noun)	inauguration (noun)
the act of starting a new operation or practice	the ceremonial induction into a position
the act of setting in operation	the act of starting a new operation or practice