Maybe it's best read as not mutually exclusive. There seem to be ships that can also carry ships.
Some of those which carry boats / Are the same which carry ships
Re:I Like That the Boat Is Stuck
by EdwardDiego on Friday March 26, 2021 @10:35AM
(#26592649)
But that's a ship carrying a ship, or did I miss something?
Clearly, Arleigh Burkes are boats.