abandon vs cave in

abandon and cave in both are nouns.

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

abandon (noun)	cave in (noun)
the trait of lacking restraint or control; reckless freedom from inhibition or worry	the sudden collapse of something into a hollow beneath it
a feeling of extreme emotional intensity

abandon (verb)	cave in (verb)
leave someone who needs or counts on you; leave in the lurch	break down, literally or metaphorically
stop maintaining or insisting on; of ideas or claims
leave behind empty; move out of
forsake, leave behind
give up with the intent of never claiming again