abandon vs forego

abandon is a noun but forego is not a noun.

Word	Noun	Adjective	Verb	Adverb
abandon	Yes	No	Yes	No
forego	No	No	Yes	No

As verbs, forego is a hyponym of abandon; that is, forego is a word with a more specific, narrower meaning than abandon:

abandon: forsake, leave behind
forego: lose (something) or lose the right to (something) by some error, offense, or crime

Other hyponyms of abandon include chuck, ditch, dispense with, forfeit, forgo, give up, throw overboard, waive, consign.

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

abandon (verb)	forego (verb)
leave someone who needs or counts on you; leave in the lurch	lose (something) or lose the right to (something) by some error, offense, or crime
stop maintaining or insisting on; of ideas or claims	do without or cease to hold or adhere to
leave behind empty; move out of	be earlier in time; go back further
forsake, leave behind
give up with the intent of never claiming again