congruence vs harmony

congruence and harmony both are nouns.

Word	Noun	Adjective	Verb	Adverb
congruence	Yes	No	No	No
harmony	Yes	No	No	No

As nouns, harmony is a hypernym of congruence; that is, harmony is a word with a broader meaning than congruence:

Other hypernyms of congruence include harmoniousness.

congruence (noun)	harmony (noun)
the quality of agreeing; being suitable and appropriate	an agreeable sound property
	compatibility in opinion and action
	agreement of opinions
	the structure of music with respect to the composition and progression of chords
	a harmonious state of things in general and of their properties (as of colors and sounds); congruity of parts with one another and with the whole