upper cannon vs cannon

upper cannon and cannon both are nouns.

Word	Noun	Adjective	Verb	Adverb
upper cannon	Yes	No	No	No
cannon	Yes	No	Yes	No

As nouns, cannon is a hypernym of upper cannon; that is, cannon is a word with a broader meaning than upper cannon:

upper cannon (noun)	cannon (noun)
cannon that provides plate armor for the upper arm	a shot in billiards in which the cue ball contacts one object ball and then the other
	lower part of the leg extending from the hock to the fetlock in hoofed mammals
	a large artillery gun that is usually on wheels
	heavy automatic gun fired from an airplane
	(Middle Ages) a cylindrical piece of armor plate to protect the arm
	heavy gun fired from a tank

upper cannon (verb)	cannon (verb)
	fire a cannon
	make a cannon