Keyword stuffing is a technique used to rank high on Google search results, but it does not work anymore.
According to an article in the Search Engine Journal, keyword stuffing involves putting all relevant keywords for your subject on the page to give it a high rank. Google changed its algorithm starting in 2003 and targeted link spam and sites that used keyword stuffing techniques.
Then in 2011, Google launched the Panda update that targeted low-quality websites and demoted keyword-stuffed pages. After this time, Google advised not to continue using keyword stuffing.
According to Google guidelines: “‘Keyword stuffing’ refers to the practice of loading a webpage with keywords or numbers in an attempt to manipulate a site’s ranking in Google search results. Often these keywords appear in a list or group or out of context (not as natural prose). Filling pages with keywords or numbers results in a negative user experience and can harm your site’s ranking. Focus on creating useful, information-rich content that uses keywords appropriately and in context.”
Therefore, you should not manipulate Google search rankings by overusing specific keywords.