Olfactory modality refers to the sense of smell. However, there are several synonyms for this term that can be used interchangeably. One such synonym is "olfaction," which is the action or process of smelling. Another synonym is "sense of smell," which refers to the ability to detect and identify odors. Other synonyms include "nasal sense," "olfactory sense," and "olfactive sense," which all refer to the same sensory system. Ultimately, the use of different synonyms allows people to describe smells and the sense of smell in various ways, adding variety and nuance to their language.