The Terps' bench was outscored 33-16 against the Hawkeyes.
“To be on the road, away from our families, not having anyone at the games — all we have is each other,” guard Marcus Dockery said.
Morsell is out after suffering a facial fracture against No. 16 Michigan on New Year's Eve.
"I'm always going to be confident in my game."
Hamilton averaged 9.5 points and 4.3 rebounds last year while at Boston College.
Reese is the brother of incoming women's basketball guard Angel Reese.
Watson averaged 36 minutes per game last season, posting 13.0 points, 3.6 rebounds and 3.4 assists.
The Terps are thin at the front-court. Here's who they could add.
Chol Marial, Donta Scott and Joshua Tomaic remain the Terps' only frontcourt options for next season.
The forward's decision leaves the Terps' frontcourt depth thin.