cyberspace vs internet

cyberspace and internet both are nouns.

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

As nouns, cyberspace and internet are synonyms defined as:

cyberspace and internet: 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 cyberspace include net.

cyberspace (noun)	internet (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