nail-biting vs tense

nail-biting is not a noun while tense is a noun.

Word	Noun	Adjective	Verb	Adverb
nail-biting	No	Yes	No	No
tense	Yes	Yes	Yes	No

nail-biting (noun)	tense (noun)
	a grammatical category of verbs used to express distinctions of time

nail-biting (adjective)	tense (adjective)
(of a situation) characterized by or causing suspense	taut or rigid; stretched tight
	pronounced with relatively tense tongue muscles (e.g., the vowel sound in `beat')
	in or of a state of physical or nervous tension

nail-biting (verb)	tense (verb)
	cause to be tense and uneasy or nervous or anxious
	become tense, nervous, or uneasy
	increase the tension on
	become stretched or tense or taut