blackthorn vs Crataegus calpodendron

blackthorn and Crataegus calpodendron both are nouns.

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

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

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

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

blackthorn (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
a thorny Eurasian bush with plumlike fruits