Word is a desktop publishing system.
LaTeX is a macro language which lays on top of TeX=Tau-Epsilon-Chi~Art in Greek
TeX is computerized typesetting that enables vector graphics--you can get TeX to draw anything you want--you can even create your own font.
More Math journals and books you'd find in the library are created using TeX than any other software system.
The poor kerning and severe limitations of Word are too many to number here.
Word is in a different class of software, the 2 aren't comparable at all.
Word is a poor WYSIWYG software package that is good for low quality desktop publishing, team collaboration but can be programmed and interacted with through VB--its useful to the general public.
LaTeX provides precision and _expression_; there are things you can do with TeX that aren't possible with Word.
Members of the Free Software community (which TeX has always been a part of) will never bow down to the Micro$oft tyranny which is so evil words can't express the depths of their corruption--the comparison is absurd.