cannon vs upper cannon

cannon and upper cannon both are nouns.

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

As nouns, upper cannon is a hyponym of cannon; that is, upper cannon is a word with a more specific, narrower meaning than cannon:

Other hyponyms of cannon include rerebrace, lower cannon, vambrace.

cannon (noun)	upper cannon (noun)
a shot in billiards in which the cue ball contacts one object ball and then the other	cannon that provides plate armor for the upper arm
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

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