Irrelation is a word commonly used to describe a lack of connection or correlation between two things. However, there are several synonyms for this word that can be used to convey the same meaning. For example, the word "unrelated" is a perfect synonym for irrelation and is often used in place of it. Other synonyms for irrelation include "disconnected," "incongruous," "unrelatedness," "disjointed," "unassociated," and "unconnected." These words are all appropriate substitutes for irrelation, and choosing the right synonym depends on the context and tone of the sentence in which it is used.