# Are all homogeneous mixtures also solutions?

The "solid" is suspended in solution in the form of colloids (colloids are very, very tiny particulates, on the order of $\text{1~1000nm}$, and they are small enough that they don't necessarily just sink to the bottom and separate from the liquid), but you can't just put your finger in milk, pull it out, and find solid on your fingers. That makes it uniform and thus a homogeneous mixture.