Heteranthera dubia vs mud plantain

Heteranthera dubia and mud plantain both are nouns.

Word	Noun	Adjective	Verb	Adverb
Heteranthera dubia	Yes	No	No	No
mud plantain	Yes	No	No	No

As nouns, Heteranthera dubia and mud plantain are synonyms defined as:

Heteranthera dubia and mud plantain: grassy-leaved North American aquatic plant with yellow star-shaped blossoms

Other synonyms of Heteranthera dubia include water star grass.

Heteranthera dubia (noun)	mud plantain (noun)
grassy-leaved North American aquatic plant with yellow star-shaped blossoms	grassy-leaved North American aquatic plant with yellow star-shaped blossoms