frazzle vs fall apart

frazzle is a noun but fall apart is not a noun.

Word	Noun	Adjective	Verb	Adverb
frazzle	Yes	No	Yes	No
fall apart	No	No	Yes	No

As verbs, fall apart is a hypernym of frazzle; that is, fall apart is a word with a broader meaning than frazzle:

Other hypernyms of frazzle include break, bust, wear, wear out.

frazzle (noun)	fall apart (noun)
a state of extreme exhaustion

frazzle (verb)	fall apart (verb)
exhaust physically or emotionally	become separated into pieces or fragments
wear away by rubbing	break or fall apart into fragments
	go to pieces
	lose one's emotional or mental composure