The words polyglot and polymath both refer to persons with extraordinary ability, although the word polyglot can also be used to describe a geographical region or a work of art.
Polyglot refers to something that contains many languages e.g. polyglot sub-continent of India. It also refers to a person who has the ability to speak many languages. The word polymath means a person who has very broad-based knowledge on a wide variety of topics.
Comparison chart
 | Polyglot | Polymath |
|---|---|---|
| Definition | A polyglot is a person who can speak, read or write in several languages. | A person with extraordinarily broad and comprehensive knowledge. Also known as polyhistor, renaissance man. |
| Explanation of rules and syntax | A polyglot may not necessarily be able to parse the language or know the rules of its syntax. | A polymath is an expert and can easily comprehend the subject at hand. |
| Correlation | Polyglots may be multilingual either because they were raised in a multilingual/multicultural environment, or because of a conscious decision to learn more languages. All polyglots are not necessarily linguists. | Polymaths are either born genius or develop sharp skills with training and experience. |
| Application of Multiple Languages | A polyglot can communicate fluently, and can use the most complex sentence structures and expressions with ease, in the perfect context. But he may not know if a certain word is an adverb or an adjective, or the rules/reasons behind the expressions. | A polymath can lead and steer discussions based on his knowledge and expertise. |
Linguist 
Homonym 
Dictionary 
Knowledge 
Poetry 
Subjective
Comments: Polyglot vs Polymath