flagpole vs flagstaff

flagpole and flagstaff both are nouns.

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

As nouns, flagpole and flagstaff are synonyms defined as:

flagpole (noun)	flagstaff (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