green arrow arum vs arrow arum

green arrow arum and arrow arum both are nouns.

Word	Noun	Adjective	Verb	Adverb
green arrow arum	Yes	No	No	No
arrow arum	Yes	No	No	No

As nouns, arrow arum is a hypernym of green arrow arum; that is, arrow arum is a word with a broader meaning than green arrow arum:

green arrow arum: perennial herb of the eastern United States having arrowhead-shaped leaves and an elongate pointed spathe and green berries
arrow arum: an aquatic plant of the genus Peltandra; North America

green arrow arum (noun)	arrow arum (noun)
perennial herb of the eastern United States having arrowhead-shaped leaves and an elongate pointed spathe and green berries	an aquatic plant of the genus Peltandra; North America