Read the word in pdf file

Question

Hello everyone, special hello to you VULPES!
So i have been reading books lately on my brand new laptop and I encountered a problem of not knowing some of the words. So i was looking for a software that would translate the words for me , i found babylon but it sucks, so I want to make my own.

So as the thread title states, how would i get the word recognizable from pdf file when i move my mouse over the word?
Like  for example I move the mouse over word "run" and it would have like little square above the word  and have all the words in native language.
And then maybe i click ctrl+space and it would write that word and translation in the notepad