Answer:
Opaque watercolor is also called gouache. While both are water-based paints, opaque watercolor contains additional fillers, typically white pigment, which give it the ability to fully cover underlying layers, unlike the translucent nature of classic watercolors.
Here are some other terms sometimes used for opaque watercolor, though less common:
Body color
Opaque water color
Poster paint (although poster paint can also be acrylic-based)
I hope this information helps!
