The phrase "admit of comparison" means to be able to be compared or contrasted to something else. There are several synonyms for this phrase, including "allow for comparison," "admit comparison," "permit comparison," and "afford comparison." These phrases are often used when discussing the similarities and differences between two or more things, and can be applied in a variety of contexts, such as science, literature, and politics. Ultimately, the use of these phrases acknowledges that there is a need to compare and contrast different things in order to gain a better understanding of them, which can help us make informed decisions and observations.