A Will is a legal document that expresses your wishes after death dealing with your property, your money and belongings. These are all called your estate.
A good article can be found on this subject at: http://nulas.ca/wp-content/uploads/2015/02/wills_and_estates_edit.pdf
Nunavut has a WILLS ACT which can be downloaded here:
Nunavut Powers of Attourney Act: