A harmonic progression is a series of chords that follow a specific pattern of musical intervals. If you're looking for synonyms for the term "harmonic progression," you may consider using words like chord progression, sequence of chords, or harmonic sequence. Some other phrases that may be used interchangeably with harmonic progression include chord changes, harmonic changes, or chord sequence. These terms are all used to describe the way that a series of chords is arranged in a piece of music, and they all convey the idea of a series of chords that work together to create a coherent musical structure.