The notes in a chord are referred to as “voices” and for this reason specific chords are referred to as being “voicings”.   Each voice of a chord has its own individual path to the next chord and this is called “voice leading”.   Chords are therefore made up of voices and each voice of the chord progresses to the voice of the next chord in a chord “progression”.   Chord progressions therefore have a vertical (harmonic) aspect as well as a melodic (horizontal) aspect.  Single note lines can therefore imply chord progressions.