The mimeograph machine was a popular printing device in the past, and even though it's no longer in use today, it's still a well-known term. However, there are some synonyms for the word 'mimeograph machine' that are not as commonly used. One of these synonyms is the 'duplicator,' which refers to a machine that creates copies of original documents. Another synonym is the 'stencil machine,' which works by creating a stencil of the original document that is then used to produce duplicate copies. Lastly, the term 'Gestetner machine' is another synonym for the mimeograph machine, which is a brand name of a similar printing device.