The technically precise term for frequency response is magnitude response

Evidence

The transfer properties of an audio signal channel are usually most often characterized by the magnitude response. This is commonly called the frequency response, but the concept magnitude response is used here since it is the proper, well-defined, and logical term. — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 498

Categorization

• DEFINE: Clarifies that ‘frequency response’ is a loose common name for the strictly correct ‘magnitude response.’
• corroborated: 2 independent passages support this claim — Ville Pulkki, Matti Karjalainen, Communication Acoustics- An…, 498