Originally posted by Febrifuge
I respectfully caution the wisdom of letting MS Word's spelling and grammar checker have the final word... 🙂 ...however I agree.
Compound words should be used when they make sense where their component words would not ("handbag," "archway," "steamroller"). While "courseload" might be acceptable or not, depending on style factors, "course load" is clear as it is, and definitely correct.