tense vs highly strung

tense is a noun but highly strung is not a noun.

Word	Noun	Adjective	Verb	Adverb
tense	Yes	Yes	Yes	No
highly strung	No	Yes	No	No

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

tense (adjective)	highly strung (adjective)
taut or rigid; stretched tight	being in a tense state
pronounced with relatively tense tongue muscles (e.g., the vowel sound in `beat')
in or of a state of physical or nervous tension

tense (verb)	highly strung (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