Yes, the noun water is a material noun.
Yes, the noun watermelon is a countablenoun; the plural form is watermelons.
yes
Watermelon is watermelon because it is a melon that it filled with water see water-melon watermelon.
watermelon watermelon
galahs can eat watermelon and watermelon skin!!
Watermelon, Watermelon, and Watermelon.
in a watermelon...
No you can not boil a watermelon.
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A watermelon lives in a warm area where watermelon seeds have been planted.
No, heaviest is an adjective, the superlative form for the adjective heavy (heavier, heaviest). Example sentence:We bought the heaviest watermelon we could find.