The category "<type_of_ship-pl>" can be expressed as follows:

<type_of_ship-pl>

aircraft carriers

amphibious assault ships

amphibious transport docks

amphibs

arsenal ships

carriers

cgs

cruisers

dds

destroyers

dock landing ships

g-ships

guided missile cruisers

landing crafts

lhds

lpds

lsds

ships

ssns

submarines

subs

supply ships