flagstaff vs flagpole

flagstaff and flagpole both are nouns.

Word	Noun	Adjective	Verb	Adverb
flagstaff	Yes	No	No	No
flagpole	Yes	No	No	No

As nouns, flagstaff and flagpole are synonyms defined as:

flagstaff (noun)	flagpole (noun)
a tall staff or pole on which a flag is raised	a tall staff or pole on which a flag is raised
	surveying instrument consisting of a straight rod painted in bands of alternate red and white each one foot wide; used for sightings by surveyors