Smalt is a term used for a blue pigment that's composed of silica, soda, and cobalt. But, there are several synonyms for the word 'smalt' that are worth knowing, such as cobalt blue, azure, cerulean, indigo, and sapphire, all of which refer to shades of blue. Additionally, some other related words to smalt include ultramarine, which is a deep blue pigment made from lapis lazuli and considered a rare and valuable color, and Turquoise, which is a semi-precious stone that ranges from light blue to green-blue. Understanding synonyms for smalt can help artists and designers to use color in a creative and meaningful way.