When we see a curve (or a normal distribution), we describe the highest value as "peak".
Let's imagine we have a curve with only a minimum value (like an inverted hat), what do we call that minimum value?
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“Trough” is commonly used, although perhaps somewhat colloquial.
The peaks are called "local modes" (specifically, the x-value is called the mode, the height would be the density at the mode).
The highest one is sometimes called "the mode".
The bottoms of troughs are often called "antimodes"