Hot and Heat
Incorrect : I can't Walk in this hot.
Correct : I can't walk in this heat. Or I can't walk in this hot weather.
Incorrect : The tea is much too heat.
Correct : The tea is much too hot.
Note: Hot is always an adjective and it cannot be used as a noun. Heat is a noun but it can also be used as a verb. You can say:
Please heat some milk for the tea. (verb)
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