Oil-colour refers to a type of paint that is made using oil as a binder to mix pigments together. However, there are several synonyms that can be used to describe this type of paint. One of the most common synonyms is oil paint, which is a more general term used to refer to any type of paint that uses oil as a binder. Another synonym for oil-colour is oil-based paint, which is a type of paint that uses oil as a solvent to thin the paint and make it easier to apply. Lastly, some people might use the term oil pastels to refer to oil-colour, which are a type of pastel that is made using oil as a binder.