seventeen-year locust vs cicala

seventeen-year locust and cicala both are nouns.

Word	Noun	Adjective	Verb	Adverb
seventeen-year locust	Yes	No	No	No
cicala	Yes	No	No	No

As nouns, cicala is a hypernym of seventeen-year locust; that is, cicala is a word with a broader meaning than seventeen-year locust:

seventeen-year locust: North American cicada; appears in great numbers at infrequent intervals because the nymphs take 13 to 17 years to mature
cicala: stout-bodied insect with large membranous wings; male has drum-like organs for producing a high-pitched drone

Other hypernyms of seventeen-year locust include cicada.

seventeen-year locust (noun)	cicala (noun)
North American cicada; appears in great numbers at infrequent intervals because the nymphs take 13 to 17 years to mature	stout-bodied insect with large membranous wings; male has drum-like organs for producing a high-pitched drone