We don't have synonyms for masticot yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are mascot, massicot and mastic.
(n) :
Obsolete form of massicot. [(chemistry) lead monoxide, PbO, obtained as a yellow amorphous powder, the fused and crystalline form of which is called litharge; lead ocher. It is used as a pigment; also, lead oxide yellow, as opposed to red lead, which is lead tetroxide Pb₃O₄.]
(n) :
Obsolete form of massicot. [(chemistry) lead monoxide, PbO, obtained as a yellow amorphous powder, the fused and crystalline form of which is called litharge; lead ocher. It is used as a pigment; also, lead oxide yellow, as opposed to red lead, which is lead tetroxide Pb₃O₄.]