jack-o'-lantern vs will-o'-the-wisp

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

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

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

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

Other synonyms of jack-o'-lantern include friar's lantern, ignis fatuus.

jack-o'-lantern (noun)	will-o'-the-wisp (noun)
lantern carved from a pumpkin	an illusion that misleads
a pale light sometimes seen at night over marshy ground	a pale light sometimes seen at night over marshy ground