So upon looking at this I immediately thought (and still believe I am on the correct page with this) that:
this is all about roman numerals and that you're looking for a number which is also a word in the English language which would make the equation true!
But there are too many variables so I created a function which you can see here. <- obviously clicking this link is a spoiler.
Very happy that all my components worked, I went ahead and clicked run only to find that non of my proposed combinations worked. It may be that:
(a) I have missed out a roman numeral or (more likely) (b) I have missed out a word which can be spelt with roman numerals. I got the list here but removed any that required punctuation as no operators are allowed. Feel free to suggest any I could add.
Edit: rereading the question I realise it says same word, but I still believe my attempt should have given the answer