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

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

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

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

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

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

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