Gudgeon and Wrist pin

Gudgeon noun - Small spiny-finned fish of coastal or brackish waters having a large head and elongated tapering body having the ventral fins modified as a sucker.

Wrist pin and gudgeon are semantically related. In some cases you can replace phrase "Wrist pin" with "Gudgeon", this terms are similar.

Wrist pin noun - Pin joining a piston to a connecting rod.

Gudgeon and wrist pin are semantically related. You can use "Gudgeon" instead a noun phrase "Wrist pin".