long tom vs cannon

long tom and cannon both are nouns.

Word	Noun	Adjective	Verb	Adverb
long tom	Yes	No	No	No
cannon	Yes	No	Yes	No

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

long tom (noun)	cannon (noun)
a long swivel cannon formerly used by the navy	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

long tom (verb)	cannon (verb)
	fire a cannon
	make a cannon