The misspelt word is: boundry
The correct spelling is: boundary.
Note:
i) Already - It means before or by now or the time in question.
ii) Library - It refers to a place where books, periodicals, and other materials are kept for people to read, study, or borrow.
iii) Instalment - It means one of the parts into which a debt that is to be paid at intervals is divided.
iv) Boundary - It refers to a line that marks the limits of an area; a dividing line. "Boundry" is a common misspelling of the word. | 
