When it comes to synonyms for overspecialize, there are a variety of words that can be used in its place. For instance, the word over-specialize can be replaced with the phrase excessively specialize, overemphasize, or obsess about. Other synonyms include hyperfocus, fixate, narrow focus, and pigeonhole. Each of these words and phrases carries a slightly different connotation and can be used depending on the specific context in which they are being used. Overall, these synonyms can help those who find themselves in a 'narrow' approach to develop a more holistic view of a situation in order to achieve better results.