Devon Collier added 12 points for Oregon State (8-2), which won its fourth straight game and improved to 6-0 at home.
Mike Phillips had 15 points and Prince Okoroh 13 points for Howard (3-9).
Oregon State led by 10 at halftime and never let Howard get closer than eight in the second half. The Beavers used an 8-2 run early in the second half to go up 41-27. They held a double-digit lead the remainder of the game, eventually going up by as many as 23.
Moreland also had 10 rebounds for the Beavers. Nelson had a career-high seven assists.