water lettuce vs Pistia stratoites

water lettuce and Pistia stratoites both are nouns.

Word	Noun	Adjective	Verb	Adverb
water lettuce	Yes	No	No	No
Pistia stratoites	Yes	No	No	No

As nouns, water lettuce and Pistia stratoites are synonyms defined as:

water lettuce and Pistia stratoites: pantropical floating plant forming a rosette of wedge-shaped leaves; a widespread weed in rivers and lakes

Other synonyms of water lettuce include pistia, Pistia stratiotes, water cabbage.

water lettuce (noun)	Pistia stratoites (noun)
pantropical floating plant forming a rosette of wedge-shaped leaves; a widespread weed in rivers and lakes	pantropical floating plant forming a rosette of wedge-shaped leaves; a widespread weed in rivers and lakes