web browser vs browser

web browser and browser both are nouns.

Word	Noun	Adjective	Verb	Adverb
web browser	Yes	No	No	No
browser	Yes	No	No	No

As nouns, web browser and browser are synonyms defined as:

web browser (noun)	browser (noun)
a program used to view HTML documents	a program used to view HTML documents
	a viewer who looks around casually without seeking anything in particular