riding lamp vs riding light

riding lamp and riding light both are nouns.

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

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

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

Other synonyms of riding lamp include anchor light.

riding lamp (noun)	riding 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