page number vs page

page number and page both are nouns.

Word	Noun	Adjective	Verb	Adverb
page number	Yes	No	No	No
page	Yes	No	Yes	No

page number (noun)	page (noun)
the system of numbering pages	one side of one leaf (of a book or magazine or newspaper or letter etc.) or the written or pictorial matter it contains
	in medieval times a youth acting as a knight's attendant as the first stage in training for knighthood
	a youthful attendant at official functions or ceremonies such as legislative functions and weddings
	a boy who is employed to run errands

page number (verb)	page (verb)
	contact, as with a pager or by calling somebody's name over a P.A. system
	number the pages of a book or manuscript
	work as a page