page vs page number

page and page number both are nouns.

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

page (noun)	page number (noun)
one side of one leaf (of a book or magazine or newspaper or letter etc.) or the written or pictorial matter it contains	the system of numbering pages
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 (verb)	page number (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