Logotype aka Word Mark is the company, product or business name itself. The logotype generally is the company, product or business name. Various fonts can be used for logotype generally depending by business type. To keep the logo image impact, some fonts are restricted to be used only in the Logotype.
The symbol, logotype and slogan can be used separately or not. The three elements can appear together or in some cases can be manipulated individually but not combined with other symbols, text, or lettering that can affect the generally your brand image.