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Pronunciation varies by accent · noun
Any of various grasses in the genus Echinochloa that are capable of growing in water..
Use water grass when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Water grass means Any of various grasses in the genus Echinochloa that are capable of growing in water..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use water grass where its definition matches the intended context.
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