Cases of word usage

1) (an instance of) agreement or harmony (between people or things) (concord)

2) harmony of spoken or musical sounds (consonance)

3) disagreement; quarrelling; (an example of) the state of not having harmony between notes etc sounded together (discord)

4) not in harmony or agreement; out of place (incongruous)

5) (beauty resulting from) the exact shape, design, of opposite parts; the quality of harmony or balance (in size, design etc) between different things (symmetry)