mud plantain vs Heteranthera dubia

mud plantain and Heteranthera dubia both are nouns.

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

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

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

Other synonyms of mud plantain include water star grass.

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