WWW vs computer network

WWW and computer network both are nouns.

Word	Noun	Adjective	Verb	Adverb
WWW	Yes	No	No	No
computer network	Yes	No	No	No

As nouns, computer network is a hypernym of WWW; that is, computer network is a word with a broader meaning than WWW:

WWW: computer network consisting of a collection of internet sites that offer text and graphics and sound and animation resources through the hypertext transfer protocol
computer network: (computer science) a network of computers

WWW (noun)	computer network (noun)
computer network consisting of a collection of internet sites that offer text and graphics and sound and animation resources through the hypertext transfer protocol	(computer science) a network of computers