knotgrass vs Paspalum distichum

knotgrass and Paspalum distichum both are nouns.

Word	Noun	Adjective	Verb	Adverb
knotgrass	Yes	No	No	No
Paspalum distichum	Yes	No	No	No

As nouns, knotgrass and Paspalum distichum are synonyms defined as:

knotgrass and Paspalum distichum: low-growing weedy grass with spikelets along the leaf stems

knotgrass (noun)	Paspalum distichum (noun)
low-growing weedy grass with spikelets along the leaf stems	low-growing weedy grass with spikelets along the leaf stems