Have you turned Off the printer for a prolonged period since the printing from legal paper?
Try turning it Off now, after loading Letter paper, carefully, and according to instructions, in both the rear feed (just two sheets there, of letter paper) and in the Front Tray also.
Reload the front tray, by the way, even though it is loaded now. Slowly, carefully, paper guides snug to the paper stack, the paper stack not too large, only 25 sheets at most.
And two sheets in the rear feed, please.
Then leave the printer, with paper loaded that way, Off for at least 15 minutes.
Meanwhile, check the printer's queue listing on the computer, and clear out any jobs there.
And then, after at least 15 minutes total down time, turn the printer On again. And send a print job from Notepad this time, not from MS Word. MS Word may be sick somehow, so let's just see if a different program - specifically, the simple Notepad application - can send a print job.
Let me know the result - and if it prints, does it print from the rear feed with two sheets only?