I see both usage, with "honors calculus" much more common. This is in reference to courses and programs in high school and universities with a higher level of requirements than the regular counterpart.
My Microsoft Word software does not like "honors", it prefers "honor's" in above context. What is the correct usage and why?
On Word if I type "Student's project was part of an honors calculus course" the word "honors" gets double blue underlining which implies questionable grammar.