sidelight vs running light

sidelight and running light both are nouns.

Word	Noun	Adjective	Verb	Adverb
sidelight	Yes	No	No	No
running light	Yes	No	No	No

As nouns, sidelight and running light are synonyms defined as:

sidelight and running light: light carried by a boat that indicates the boat's direction; vessels at night carry a red light on the port bow and a green light on the starboard bow

sidelight (noun)	running light (noun)
light carried by a boat that indicates the boat's direction; vessels at night carry a red light on the port bow and a green light on the starboard bow	light carried by a boat that indicates the boat's direction; vessels at night carry a red light on the port bow and a green light on the starboard bow