public convenience vs can

public convenience and can both are nouns.

Word	Noun	Adjective	Verb	Adverb
public convenience	Yes	No	No	No
can	Yes	No	Yes	No

As nouns, can is a hypernym of public convenience; that is, can is a word with a broader meaning than public convenience:

Other hypernyms of public convenience include facility, bathroom, john, lav, lavatory, privy, toilet.

public convenience (noun)	can (noun)
a toilet that is available to the public	airtight sealed metal container for food or drink or paint etc.
	a room or building equipped with one or more toilets
	a plumbing fixture for defecation and urination
	the fleshy part of the human body that you sit on
	a buoy with a round bottom and conical top
	the quantity contained in a can

public convenience (verb)	can (verb)
	preserve in a can or tin
	terminate the employment of; discharge from an office or position