flying bridge vs flybridge

flying bridge and flybridge both are nouns.

Word	Noun	Adjective	Verb	Adverb
flying bridge	Yes	No	No	No
flybridge	Yes	No	No	No

As nouns, flying bridge and flybridge are synonyms defined as:

flying bridge and flybridge: the highest navigational bridge on a ship; a small (often open) deck above the pilot house

Other synonyms of flying bridge include fly bridge, monkey bridge.

flying bridge (noun)	flybridge (noun)
the highest navigational bridge on a ship; a small (often open) deck above the pilot house	the highest navigational bridge on a ship; a small (often open) deck above the pilot house