What is intended by the statement " the word is not the thing" ?

George orwell intended for his novel to be a warning against totalitarianism. use examples from the novel to show things that are present in the novel that can be found in societies today.

After swimming for hours he was tired what is the personal pronoun in the sentence below

Lorek lives near the north pole. the snow in his backyard adds water to the atmosphere through )transpiration )evaporation )sublimation )condensation