The word "cobordant" is relatively uncommon and not widely used in everyday language. As a result, finding synonyms for "cobordant" can be a difficult task. However, there are a few words that can be used interchangeably with "cobordant" to convey a similar meaning. These words include "coincident," "concurrent," "synchronous," and "parallel." All of these words refer to two or more events or circumstances happening at the same time or alongside each other. While each of these words has slightly different connotations, they can all be used in place of "cobordant" if needed.