anchor light vs riding lamp

anchor light and riding lamp both are nouns.

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

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

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

Other synonyms of anchor light include riding light.

anchor 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