ignis fatuus vs friar's lantern

ignis fatuus and friar's lantern both are nouns.

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

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

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

Other synonyms of ignis fatuus include jack-o'-lantern, will-o'-the-wisp.

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