threat vs scourge

threat and scourge both are nouns.

Word	Noun	Adjective	Verb	Adverb
threat	Yes	No	No	No
scourge	Yes	No	Yes	No

As nouns, threat and scourge are synonyms defined as:

Other synonyms of threat include terror.

threat (noun)	scourge (noun)
a warning that something unpleasant is imminent	a whip used to inflict punishment
declaration of an intention or a determination to inflict harm on another	a person who inspires fear or dread
a person who inspires fear or dread	something causing misery or death
something that is a source of danger

threat (verb)	scourge (verb)
	cause extensive destruction or ruin utterly
	whip
	punish severely; excoriate