The word "subminiature" is used to describe something that is extremely small in size or scale. There are several synonyms that can be used in place of this word, including "microscopic," "tiny," "minuscule," "slight," "compact," and "small-scale." These words can be used to describe things like electronic components, miniaturized machines, or small-scale models. They are also commonly used in the context of photography and videography, where small, low-profile cameras are often referred to as "subminiature cameras." No matter the context, these synonyms convey a sense of extreme smallness and precision, and are useful for describing things that are too small to be seen with the naked eye.