Crataegus tomentosa vs Crataegus calpodendron

Crataegus tomentosa and Crataegus calpodendron both are nouns.

Word	Noun	Adjective	Verb	Adverb
Crataegus tomentosa	Yes	No	No	No
Crataegus calpodendron	Yes	No	No	No

As nouns, Crataegus tomentosa and Crataegus calpodendron are synonyms defined as:

Crataegus tomentosa and Crataegus calpodendron: erect and almost thornless American hawthorn with somewhat pear-shaped berries

Other synonyms of Crataegus tomentosa include blackthorn, pear haw, pear hawthorn.

Crataegus tomentosa (noun)	Crataegus calpodendron (noun)
erect and almost thornless American hawthorn with somewhat pear-shaped berries	erect and almost thornless American hawthorn with somewhat pear-shaped berries