Love, mum, dad, nature, peace, happiness, trees... And I agree, harmony. Melody, melodious, harmonious, piano, music, university... Nature, learning and music generally, I think.
I also love words that end in "-under" - assunder, thunder, blunder... (even chunder, though to a slightly lesser extent...

).
- amélioré (from améliorer, to improve [French])
- ahijado (godson [Spanish])
- farmacéutica (pharmacy [Spanish])
- murciélagos (bats [Spanish])
- perpustakaan (library [Indonesian])
- beristirahat (rest [Indonesian])
Diphthongs. I love diphthongs.