flypast vs flyover

flypast and flyover both are nouns.

Word	Noun	Adjective	Verb	Adverb
flypast	Yes	No	No	No
flyover	Yes	No	No	No

As nouns, flypast and flyover are synonyms defined as:

flypast and flyover: a flight at a low altitude (usually of military aircraft) over spectators on the ground

Other synonyms of flypast include fly-by.

flypast (noun)	flyover (noun)
a flight at a low altitude (usually of military aircraft) over spectators on the ground	a flight at a low altitude (usually of military aircraft) over spectators on the ground
	bridge formed by the upper level of a crossing of two highways at different levels