expostulation vs communication

expostulation and communication both are nouns.

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

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

expostulation: the act of expressing earnest opposition or protest
communication: the activity of communicating; the activity of conveying information

Other hypernyms of expostulation include communicating.

expostulation (noun)	communication (noun)
the act of expressing earnest opposition or protest	something that is communicated by or to or between people or groups
an exclamation of protest or remonstrance or reproof	the activity of communicating; the activity of conveying information
	a connection allowing access between persons or places