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The word grape is a noun, a word for a thing; grape is a singular, common, concrete noun.
the fifth letter in the word grape is "e".
There was a grape under the table. The grape was rotten.
The word "grape" has a long a sound. The "a" in grape is pronounced as /eɪ/, like in the word "shape."
No, the word "grape" does not have a short "a" sound. It has a long "a" sound.