riding lamp vs anchor light

riding lamp and anchor light both are nouns.

Word	Noun	Adjective	Verb	Adverb
riding lamp	Yes	No	No	No
anchor light	Yes	No	No	No

As nouns, riding lamp and anchor light are synonyms defined as:

riding lamp and anchor light: a light in the rigging of a ship that is riding at anchor

Other synonyms of riding lamp include riding light.

riding lamp (noun)	anchor light (noun)
a light in the rigging of a ship that is riding at anchor	a light in the rigging of a ship that is riding at anchor