vis major vs act of God

vis major and act of God both are nouns.

Word	Noun	Adjective	Verb	Adverb
vis major	Yes	No	No	No
act of God	Yes	No	No	No

As nouns, vis major and act of God are synonyms defined as:

vis major and act of God: a natural and unavoidable catastrophe that interrupts the expected course of events

Other synonyms of vis major include force majeure, inevitable accident, unavoidable casualty.

vis major (noun)	act of God (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