lesser duckweed vs Lemna minor

lesser duckweed and Lemna minor both are nouns.

Word	Noun	Adjective	Verb	Adverb
lesser duckweed	Yes	No	No	No
Lemna minor	Yes	No	No	No

As nouns, lesser duckweed and Lemna minor are synonyms defined as:

lesser duckweed and Lemna minor: of temperate regions except eastern Asia and Australia

Other synonyms of lesser duckweed include common duckweed.

lesser duckweed (noun)	Lemna minor (noun)
of temperate regions except eastern Asia and Australia	of temperate regions except eastern Asia and Australia