harmony A2

/ˈhɑ̟ɹ.mə.ni/ A state in which people get along well and agree with one another.

harmonic C2+

/hɑrˈmɑnɪk/ relating to harmony or to frequencies that are multiples of a fundamental tone

harmonious C2+

/hɑːrˈmoʊniəs/ forming a pleasing or consistent whole; free from discord

harmonize C2+

/ˈhɑːrməˌnaɪz/ to bring into agreement or pleasing arrangement; to sing in harmony