Longcase clock and Pendulum clock

Longcase clock noun - A pendulum clock enclosed in a tall narrow case.

Pendulum clock and longcase clock are semantically related. In some cases you can use "Pendulum clock" instead a noun phrase "Longcase clock".

Pendulum clock noun - A clock regulated by a pendulum.

Longcase clock and pendulum clock are semantically related. Sometimes you can replace phrase "Longcase clock" with "Pendulum clock", this phrases are similar.