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Pronunciation varies by accent · noun
A strong, lightweight material consisting of an inner layer of polystyrene clad with outer facing of either white clay-coated paper or brown kraft paper..
Use foamboard when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Foamboard means A strong, lightweight material consisting of an inner layer of polystyrene clad with outer facing of either white clay-coated paper or brown kraft paper..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use foamboard where its definition matches the intended context.
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