Twitter vs communication

Twitter and communication both are nouns.

Word	Noun	Adjective	Verb	Adverb
Twitter	Yes	No	No	No
communication	Yes	No	No	No

As nouns, communication is a hypernym of Twitter; that is, communication is a word with a broader meaning than Twitter:

Twitter (noun)	communication (noun)
A social media messaging service limited to 140 characters	something that is communicated by or to or between people or groups
	the activity of communicating; the activity of conveying information
	a connection allowing access between persons or places