compatibility vs accord

compatibility and accord both are nouns.

Word	Noun	Adjective	Verb	Adverb
compatibility	Yes	No	No	No
accord	Yes	No	Yes	No

As nouns, accord is a hyponym of compatibility; that is, accord is a word with a more specific, narrower meaning than compatibility:

compatibility: capability of existing or performing in harmonious or congenial combination
accord: sympathetic compatibility

Other hyponyms of compatibility include congeniality, congenialness, harmoniousness, harmony, agreement, correspondence.

compatibility (noun)	accord (noun)
capability of existing or performing in harmonious or congenial combination	sympathetic compatibility
a feeling of sympathetic understanding	concurrence of opinion
	a written agreement between two states or sovereigns
	harmony of people's opinions or actions or characters

compatibility (verb)	accord (verb)
	allow to have
	go together