internet vs cyberspace

internet and cyberspace both are nouns.

Word	Noun	Adjective	Verb	Adverb
internet	Yes	No	No	No
cyberspace	Yes	No	No	No

As nouns, internet and cyberspace are synonyms defined as:

internet and cyberspace: a computer network consisting of a worldwide network of computer networks that use the TCP/IP network protocols to facilitate data transmission and exchange

Other synonyms of internet include net.

internet (noun)	cyberspace (noun)
a computer network consisting of a worldwide network of computer networks that use the TCP/IP network protocols to facilitate data transmission and exchange	a computer network consisting of a worldwide network of computer networks that use the TCP/IP network protocols to facilitate data transmission and exchange