"Everyone has their own language." I assumed. Just because we do not understand what other animals say, we cannot say they have their own language.
There seems to be a different type of language. Human language is different on its own. It's interesting how our language is distinct from various other languages.
Our language is arbitrary.
There is no natural link between word and it's meanings. Can the pen be called by another name, yes we can if everyone decides so. Is it an object or work. It can mean a lot in different ways.
There are words that are made of their sounds as well. Called Onomatopoeic sounds. Ouch. Learnt a lot in one day. Time for the break.