will-o'-the-wisp vs friar's lantern

will-o'-the-wisp and friar's lantern both are nouns.

Word	Noun	Adjective	Verb	Adverb
will-o'-the-wisp	Yes	No	No	No
friar's lantern	Yes	No	No	No

As nouns, will-o'-the-wisp and friar's lantern are synonyms defined as:

will-o'-the-wisp and friar's lantern: a pale light sometimes seen at night over marshy ground

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

will-o'-the-wisp (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