fall in vs abandon

fall in is not a noun while abandon is a noun.

Word	Noun	Adjective	Verb	Adverb
fall in	No	No	Yes	No
abandon	Yes	No	Yes	No

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

fall in (verb)	abandon (verb)
break down, literally or metaphorically	leave someone who needs or counts on you; leave in the lurch
become part of; become a member of a group or organization	stop maintaining or insisting on; of ideas or claims
to take one's place in a military formation or line	leave behind empty; move out of
	forsake, leave behind
	give up with the intent of never claiming again