auricula vs primula

auricula and primula both are nouns.

Word	Noun	Adjective	Verb	Adverb
auricula	Yes	No	No	No
primula	Yes	No	No	No

As nouns, primula is a hypernym of auricula; that is, primula is a word with a broader meaning than auricula:

auricula: yellow-flowered primrose native to Alps; commonly cultivated
primula: any of numerous short-stemmed plants of the genus Primula having tufted basal leaves and showy flowers clustered in umbels or heads

Other hypernyms of auricula include primrose.

auricula (noun)	primula (noun)
a pouch projecting from the top front of each atrium of the heart	any of numerous short-stemmed plants of the genus Primula having tufted basal leaves and showy flowers clustered in umbels or heads
yellow-flowered primrose native to Alps; commonly cultivated