Hi Paul,
A tif file is an image file and as such it will not open in Word - you can add it to a Word document by choosing Insert - Picture
You can open the tif file in the Photos App and choose File - Print and then choose Microsoft Print to PDF as the printer, this will create a PDF version of the file . . .
In all honesty, tif files are generally much clearer than jpg files, if it does not look clear on the screen, maybe get another version of the scanned file . . .