Is it theologically correct to refer to the Trinity as "Others" when speaking about them in a particular sentence.
You cannnot change yourself without the help of the Others
I believe the only time when God is referred to with a plural noun or pronoun is in Genesis 1, when God Himself refers to Himself. The Bible always mentions the Father, Son and Holy Ghost separately when referring to the separate persons of God together. Otherwise, it is "He" and "Him." God is always a singular pronoun. There is no need to refer to the Trinity as your question suggests, for God is one.
However, there are no strict directives in the Bible about new terms used to describe the Trinity. But it's important that Christians do not stray too far from the language that has been given to us in the Scriptures to avoid confusion or perversion of the text. Every word of Scripture is God-breathed, so there is a good reason why there are not many words to describe the Trinity. YHWH, I AM THAT I AM, The Godhead, and The Fullness of the Glory of God, come to mind, but even these examples must be taken into the context of their Hebrew/Greek origin and their texts.
That said, even Biblical terms can be twisted to mean something completely different from their traditional, Biblical understanding. The Trinity, even, means something very different to different people. It would be foolhardy to bring in another word that is not clearly defined or established in Biblical text or received Christian tradition.
[important note]:Addressing or referring to the Godhead should always be done with reverence. This is a basic truth embedded in the 10 commandments.