riding light vs anchor light

riding light and anchor light both are nouns.

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

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

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

Other synonyms of riding light include riding lamp.

riding light (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