I know the color theory names in Spanish, I'm sorry if the translation does not correspond to the terminology in English.
Dominant Color: is the color with the highest predominance in perception, without the need to occupy a larger space. It's the color with which we remember the object after seeing it.
Subordinate Color: is the secondary color in quantity. It may occupy a larger space than the dominant color but perceptually it's not so relevant.
Accent: it's the color touch, the point that draws attention. Perceptively the second in importance after the dominant color.
Underlying Colors: the colors behind the dominant and the subordinate, the third order colors, those that fill the work without highlighting the others. Difficult to remember by their name, from the perceptive point of view remain in a very distant plane.
Color Details: colors of reduced proportions, without becoming accents, complete a detailed chromatic components description of the object. Unlike the underlying colors, and despite appearing in small proportions, they are usually easy to remember by the color name.
A good exercise to define color components of an object is to divide it in areas. Using the Photoshop Filter Mosaic makes it easy to find the chromatic components:
Following this example:
The red picture (dominant color) with orange lines (subordinate) and some light blue spots (accent) with dark areas (underlying) and details in yellow, pink and lilac (color details).
Without knowing the work that the question refers to, and following the explanation, I would define those spot colors as Color Details.
One of the Spanish translations of Spot Color is Color Point, a good definition of Color Details.
Photo 1 and Photo 2 from unsplash.com