The word "pneumatograph" is a technical term that refers to a device used to record the movement of air or gas, such as in respiration or ventilation. There are several synonyms for this word that can be used depending on the context and the specific application of the device. Some alternatives include "spirometer," which is a type of device used to measure lung function, "pulmonary function device," "respiratory analyzer," "breathing monitor," and "ventilation test device." Each of these terms describes a device that performs a similar function as a pneumatograph, but may have slightly different features or capabilities depending on its design and intended use.