force majeure vs inevitable accident

force majeure and inevitable accident both are nouns.

Word	Noun	Adjective	Verb	Adverb
force majeure	Yes	No	No	No
inevitable accident	Yes	No	No	No

As nouns, force majeure and inevitable accident are synonyms defined as:

force majeure and inevitable accident: a natural and unavoidable catastrophe that interrupts the expected course of events

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

force majeure (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