exam vs communication

exam and communication both are nouns.

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

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

exam: a set of questions or exercises evaluating skill or knowledge
communication: the activity of communicating; the activity of conveying information

Other hypernyms of exam include communicating.

exam (noun)	communication (noun)
a set of questions or exercises evaluating skill or knowledge	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