Very strange but true.

In fiction language can be a potential problem. Especially in SF and fantasy. Aliens (as in ones not native to earth!) will not speak the same native language. People in the far distant future will not speak what is spoken today. But a compromise has to be met. If they do not, then readers will not understand them. Aliens could learn an Earth language of course, and vice versa, but amongst themselves they would have different words for things. Humans in the distant future would have their own words for things. Words evolve. A tree may become called a greet. We would not understand them any more then we would understand a Stoneage person. So that has to be ignored and it has to be written as if it's almost people speaking to each other as they do today. A tree would still have to be called a tree. Although 'trendy' and 'buzz' words should be avoided, that are not even understood by everyone even today!