friar's lantern vs ignis fatuus

friar's lantern and ignis fatuus both are nouns.

Word	Noun	Adjective	Verb	Adverb
friar's lantern	Yes	No	No	No
ignis fatuus	Yes	No	No	No

As nouns, friar's lantern and ignis fatuus are synonyms defined as:

friar's lantern and ignis fatuus: a pale light sometimes seen at night over marshy ground

Other synonyms of friar's lantern include jack-o'-lantern, will-o'-the-wisp.

friar's lantern (noun)	ignis fatuus (noun)
a pale light sometimes seen at night over marshy ground	an illusion that misleads
	a pale light sometimes seen at night over marshy ground