Cacuminous is a term used to describe a peak or summit. However, if you're seeking other words with similar meanings, there are several synonyms worth exploring. For example, the word "apex" refers to the highest point or the top of something. "Crest" typically describes the uppermost point of a wave or the top of a hill. "Pinnacle" is another synonym, which suggests the highest level of achievement or endpoint of a journey. Finally, "zenith" refers to the highest point of an arc or celestial body in the sky. All of these synonyms can be used interchangeably with cacuminous to describe the highest or topmost point of an object or concept.