Gudgeon and Stem

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.

Stem and gudgeon are semantically related. In some cases you can use "Stem" instead a noun "Gudgeon".

Stem noun - Cylinder forming a long narrow part of something.

Gudgeon and stem are semantically related. Sometimes you can use "Gudgeon" instead a noun "Stem".