The word "MAR ENG BULL" appears to be a combination of three different words or terms, rather than a single word. From the given text, it is challenging to accurately determine its meaning or provide synonyms for it. The word "MAR" could be a truncation of "maritime" or related to "sea", while "ENG" might refer to "engineering". "BULL" may be short for "bulletin" or have some other significance. To provide an article with synonyms, more context or information is required.