high-strung vs tense

high-strung is not a noun while tense is a noun.

Word	Noun	Adjective	Verb	Adverb
high-strung	No	Yes	No	No
tense	Yes	Yes	Yes	No

high-strung (noun)	tense (noun)
	a grammatical category of verbs used to express distinctions of time

high-strung (adjective)	tense (adjective)
being in a tense state	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

high-strung (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