window cleaner vs cleaner

window cleaner and cleaner both are nouns.

Word	Noun	Adjective	Verb	Adverb
window cleaner	Yes	No	No	No
cleaner	Yes	No	No	No

As nouns, cleaner is a hypernym of window cleaner; that is, cleaner is a word with a broader meaning than window cleaner:

window cleaner (noun)	cleaner (noun)
someone who cleans windows for pay	a preparation used in cleaning something
	someone whose occupation is cleaning
	the operator of dry-cleaning establishment