Vocal expression is a phrase commonly used to describe the use of one's voice to convey emotions or feelings. There are several synonyms for this phrase which can add depth and variety to your writing. One possible alternative is "verbal articulation," which emphasizes the clarity and effectiveness of the speaker's words. Another option is "speech intonation," which highlights the tone and inflection of the speaker's voice. Other synonyms for vocal expression include "verbalization," "pronunciation," "enunciation," and "utterance." By using different synonyms for the concept of vocal expression, you can enhance the impact and diversity of your writing and communication.