bathroom vs convenience

bathroom and convenience both are nouns.

Word	Noun	Adjective	Verb	Adverb
bathroom	Yes	No	No	No
convenience	Yes	No	No	No

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

bathroom (noun)	convenience (noun)
a room (as in a residence) containing a bathtub or shower and usually a washbasin and toilet	a device or control that is very useful for a particular job
a room or building equipped with one or more toilets	a toilet that is available to the public
	the quality of being useful and convenient
	the state of being suitable or opportune