flyover vs flypast

flyover and flypast both are nouns.

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

As nouns, flyover and flypast are synonyms defined as:

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

Other synonyms of flyover include fly-by.

flyover (noun)	flypast (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