Crutch and Rowlock

Crutch noun - A wooden or metal staff that fits under the armpit and reaches to the ground; used by disabled person while walking.

Rowlock and crutch are semantically related. In some cases you can use "Rowlock" instead a noun "Crutch".

Rowlock noun - A holder attached to the gunwale of a boat that holds the oar in place and acts as a fulcrum for rowing.

Crutch and rowlock are semantically related. You can use "Crutch" instead a noun "Rowlock".