anchor light vs riding light

anchor light and riding light both are nouns.

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

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

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

Other synonyms of anchor light include riding lamp.

anchor light (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