"Catch a whiff of" is a common phrase used to describe the act of smelling something. However, there are several alternative synonyms that can be used to convey the same meaning. Other words that can be used as synonyms for "catch a whiff" include "sniff", "smell", "detect", "retrieve", "perceive", and "sense". Each of these words can be used in different contexts or situations, depending on the intention and desired effect of the speaker or writer. Ultimately, the use of synonyms can help to add variety and interest to language, and can allow for greater precision and nuance in communication.