Stillson wrench and Tube wrench

Stillson wrench noun - A large pipe wrench with L-shaped adjustable jaws that tighten as pressure on the handle is increased.

Tube wrench and stillson wrench are semantically related. In some cases you can use "Tube wrench" instead a noun phrase "Stillson wrench".

Tube wrench noun - Adjustable wrench for gripping and turning a pipe; has two serrated jaws that are adjusted to grip the pipe.

Stillson wrench and tube wrench are semantically related. Sometimes you can replace phrase "Stillson wrench" with "Tube wrench", this phrases are similar.