affect vs tense up

affect is a noun but tense up is not a noun.

Word	Noun	Adjective	Verb	Adverb
affect	Yes	No	Yes	No
tense up	No	No	Yes	No

As verbs, tense up is a hyponym of affect; that is, tense up is a word with a more specific, narrower meaning than affect:

affect (noun)	tense up (noun)
the conscious subjective aspect of feeling or emotion

affect (verb)	tense up (verb)
act physically on; have an effect upon	cause to be tense and uneasy or nervous or anxious
have an effect upon	become tense, nervous, or uneasy
make believe with the intent to deceive
have an emotional or cognitive impact upon
connect closely and often incriminatingly