rest period vs interruption

rest period and interruption both are nouns.

Word	Noun	Adjective	Verb	Adverb
rest period	Yes	No	No	No
interruption	Yes	No	No	No

As nouns, interruption is a hypernym of rest period; that is, interruption is a word with a broader meaning than rest period:

rest period: a pause for relaxation
interruption: a time interval during which there is a temporary cessation of something

Other hypernyms of rest period include break, intermission, pause, suspension.

rest period (noun)	interruption (noun)
a pause for relaxation	an act of delaying or interrupting the continuity
	some abrupt occurrence that interrupts an ongoing activity
	a time interval during which there is a temporary cessation of something