browser vs application program

browser and application program both are nouns.

Word	Noun	Adjective	Verb	Adverb
browser	Yes	No	No	No
application program	Yes	No	No	No

As nouns, application program is a hypernym of browser; that is, application program is a word with a broader meaning than browser:

browser: a program used to view HTML documents
application program: a program that gives a computer instructions that provide the user with tools to accomplish a task

Other hypernyms of browser include application, applications programme.

browser (noun)	application program (noun)
a program used to view HTML documents	a program that gives a computer instructions that provide the user with tools to accomplish a task
a viewer who looks around casually without seeking anything in particular