When it comes to referring to a "system of parts," there are a number of synonyms that can be used to convey the same meaning. Some examples include "mechanism," "constellation," "structure," "arrangement," "composition," and "configuration." Each of these words can be useful in various contexts and can help to provide a nuanced and precise way of describing a complex system or group of interconnected components. By selecting the right synonym for a given situation, writers and speakers can ensure that their message is communicated effectively and accurately to their audience.