Appropriate "title" to list on application for professors writing LOR? In filling out my very first grad school application I've come across the Letters of Recommendation page. It says to list the "Title" of the recommender. Do I use Professor here? Or Dr.? I am stumped. Both of my recommenders are professors and that is how I refer to them, but I am just not sure which one I should be putting here since they have Doctorate degrees. I don’t want to make a mistake... I found this question which was sort of related, but also confused me even more. If the professor has a title like X-Y Professor of Z or Professor of X and Y, do I use that full title? Or should I just write "Professor" or "Professor of [subject]"?
"Professor" is in some respects a more "advanced" title because many people who have doctorates are not professors. You may have writers who have a doctorate, but do not hold a professorship. 

I would put "Professor," but in most places, it does not matter at all. (I've read that Germany for example is a stickler for titles, though.)

It would not be typical to include "Professor of [X]."