walk out vs abandon

walk out is not a noun while abandon is a noun.

Word	Noun	Adjective	Verb	Adverb
walk out	No	No	Yes	No
abandon	Yes	No	Yes	No

As verbs, abandon is a hypernym of walk out; that is, abandon is a word with a broader meaning than walk out:

Other hypernyms of walk out include desert, desolate, forsake.

walk out (noun)	abandon (noun)
	the trait of lacking restraint or control; reckless freedom from inhibition or worry
	a feeling of extreme emotional intensity

walk out (verb)	abandon (verb)
leave suddenly, often as an expression of disapproval	leave someone who needs or counts on you; leave in the lurch
leave abruptly, often in protest or anger	stop maintaining or insisting on; of ideas or claims
stop work in order to press demands	leave behind empty; move out of
	forsake, leave behind
	give up with the intent of never claiming again