polyanthus vs primula

polyanthus and primula both are nouns.

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

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

polyanthus: florists' primroses; considered a complex hybrid derived from oxlip, cowslip, and common primrose
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 polyanthus include primrose.

polyanthus (noun)	primula (noun)
florists' primroses; considered a complex hybrid derived from oxlip, cowslip, and common primrose	any of numerous short-stemmed plants of the genus Primula having tufted basal leaves and showy flowers clustered in umbels or heads