dead heat vs standoff

dead heat and standoff both are nouns.

Word	Noun	Adjective	Verb	Adverb
dead heat	Yes	No	No	No
standoff	Yes	No	No	No

As nouns, standoff is a hypernym of dead heat; that is, standoff is a word with a broader meaning than dead heat:

dead heat: a tie in a race
standoff: the finish of a contest in which the score is tied and the winner is undecided

Other hypernyms of dead heat include draw, tie.

dead heat (noun)	standoff (noun)
a tie in a race	the act of repulsing or repelling an attack; a successful defensive stand
	the finish of a contest in which the score is tied and the winner is undecided