Words are not as simplistic as we think they are and carry as many complications with them as much as there are errors in a website not designed and developed properly.
The Semantics is a branch of Linguistic and Philosophy that is concerned with their ambiguous nature and multiple meanings of even a single.
Similar attempts have been made by Google through the process of Search Engine Optimization to simplify the written content and give priority to the meaning of it rather than producing something that is meaningless and consequently useless.
The priority given to the Semantics in the generation of the keywords is a great way to make your content relevant in a lot of search engine results and increases your website’s chances of appearing in more Search Engine Result Pages (SERPs) than you had with the gibberish content.
The prime example of the use of Semantics in SEO is when you make spelling errors while typing but the search engine successfully guesses the right term that was in your mind and presents to you the results according to that guess.
Similarly, when you put an unpopular term in the search bar and click on search, you witness a search result that consists not only of the largely used key phrase but also how it is related to the term that you used to find it.
Synonyms are obviously used in the Semantic Keywords because what two words hold more similarities than them. Besides, it is not grammatically coherent to use a keyword or phrase again and again in your content, we usually use two different phrases with the same meaning while writing a long piece because repetition becomes boring and causes us to lose interest.
This is one reason why it should be included in your website’s content; because it is not as hard to include them as we first thought.
The function of guessing comes from the ability to incorporate the related ideas and concepts in the search engine results and that ability is provided to Google by the Latent Semantic Indexing (LSI).
Concerned with Finding relationships between words and by the simple correlation of their meanings, LSI is a process of finding more related key terms that are already being used. The more your content contains the semantic keywords, the lesser chance it has of going out of relevance.
Eventually, it will bring more traffic to your website, so there is possibly no reason why you should not use Semantic Keywords.