ignis fatuus vs visible light

ignis fatuus and visible light both are nouns.

Word	Noun	Adjective	Verb	Adverb
ignis fatuus	Yes	No	No	No
visible light	Yes	No	No	No

As nouns, visible light is a hypernym of ignis fatuus; that is, visible light is a word with a broader meaning than ignis fatuus:

ignis fatuus: a pale light sometimes seen at night over marshy ground
visible light: (physics) electromagnetic radiation that can produce a visual sensation

Other hypernyms of ignis fatuus include light, visible radiation.

ignis fatuus (noun)	visible light (noun)
an illusion that misleads	(physics) electromagnetic radiation that can produce a visual sensation
a pale light sometimes seen at night over marshy ground