act of God vs inevitable accident

act of God and inevitable accident both are nouns.

Word	Noun	Adjective	Verb	Adverb
act of God	Yes	No	No	No
inevitable accident	Yes	No	No	No

As nouns, act of God and inevitable accident are synonyms defined as:

act of God and inevitable accident: a natural and unavoidable catastrophe that interrupts the expected course of events

Other synonyms of act of God include force majeure, unavoidable casualty, vis major.

act of God (noun)	inevitable accident (noun)
a natural and unavoidable catastrophe that interrupts the expected course of events	a natural and unavoidable catastrophe that interrupts the expected course of events