sweet potato vs ocarina

sweet potato and ocarina both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweet potato	Yes	No	No	No
ocarina	Yes	No	No	No

As nouns, sweet potato and ocarina are synonyms defined as:

sweet potato and ocarina: egg-shaped terracotta wind instrument with a mouthpiece and finger holes

sweet potato (noun)	ocarina (noun)
egg-shaped terracotta wind instrument with a mouthpiece and finger holes	egg-shaped terracotta wind instrument with a mouthpiece and finger holes
the edible tuberous root of the sweet potato vine which is grown widely in warm regions of the United States
pantropical vine widely cultivated in several varieties for its large sweet tuberous root with orange flesh