riding light vs riding lamp

riding light and riding lamp both are nouns.

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

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

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

Other synonyms of riding light include anchor light.

riding light (noun)	riding lamp (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