stonecrop vs Sedum acre

stonecrop and Sedum acre both are nouns.

Word	Noun	Adjective	Verb	Adverb
stonecrop	Yes	No	No	No
Sedum acre	Yes	No	No	No

As nouns, Sedum acre is a hyponym of stonecrop; that is, Sedum acre is a word with a more specific, narrower meaning than stonecrop:

stonecrop: any of various northern temperate plants of the genus Sedum having fleshy leaves and red or yellow or white flowers
Sedum acre: mossy European creeping sedum with yellow flowers; widely introduced as a ground cover

Other hyponyms of stonecrop include wall pepper.

stonecrop (noun)	Sedum acre (noun)
any of various northern temperate plants of the genus Sedum having fleshy leaves and red or yellow or white flowers	mossy European creeping sedum with yellow flowers; widely introduced as a ground cover