The word 'spotest' may not be a common term used in everyday vocabulary. However, there are several synonyms that can be used interchangeably depending on the context. 'Spotest' refers to the action of spotting or seeing something. One can use 'observe,' 'notice,' 'detect,' 'discern,' or 'identify' as synonyms for this term. Each of these words varies slightly in its meaning and connotation, but they all refer to the act of seeing or recognizing something. For instance, one might observe or notice something that catches their attention, while identifying or discerning requires a more deliberate effort to recognize or distinguish among similar things.