surrender vs concede

surrender is a noun but concede is not a noun.

Word	Noun	Adjective	Verb	Adverb
surrender	Yes	No	Yes	No
concede	No	No	Yes	No

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

Other hyponyms of surrender include abnegate, capitulate.

surrender (noun)	concede (noun)
the act of surrendering (usually under agreed conditions)
the delivery of a principal into lawful custody
a verbal act of admitting defeat
acceptance of despair

surrender (verb)	concede (verb)
give up or agree to forgo to the power or possession of another	admit (to a wrongdoing)
relinquish possession or control over	be willing to concede
	acknowledge defeat
	give over; surrender or relinquish to the physical control of another