hosepipe vs watercannon

hosepipe and watercannon both are nouns.

Word	Noun	Adjective	Verb	Adverb
hosepipe	Yes	No	No	No
watercannon	Yes	No	No	No

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

hosepipe: a flexible pipe for conveying a liquid or gas
watercannon: a hose (carried on a truck) that fires water under high pressure to disperse crowds (especially crowds of rioters)

Other hyponyms of hosepipe include air hose, airline, fire hose, garden hose, radiator hose, water cannon.

hosepipe (noun)	watercannon (noun)
a flexible pipe for conveying a liquid or gas	a hose (carried on a truck) that fires water under high pressure to disperse crowds (especially crowds of rioters)