Crataegus calpodendron vs Crataegus tomentosa

Crataegus calpodendron and Crataegus tomentosa both are nouns.

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

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

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

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

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