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Pronunciation varies by accent · noun
Any of several plants of the genus Polygonum, with jointed stems and inconspicuous flowers.
Use knotweed when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Knotweed means Any of several plants of the genus Polygonum, with jointed stems and inconspicuous flowers.
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use knotweed where its definition matches the intended context.
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