Astrograph is a scientific term used to refer to the telescope or camera used to capture astronomical images. However, there are several other synonyms you can use to refer to the same entity. For instance, some astronomers would use "astrocamera" to describe the same device. Others may use the term "astrophotography" to refer to the art of taking pictures of stars and other celestial objects. Similarly, you can use "astronomical telescope" or simply "telescope" to describe the same device. In summary, there are several synonyms you can use to refer to the device used to capture celestial images, depending on the context and the preference of the speaker.