Any article rewriter or paraphrasing tool basically scans through the content you provide it in order to look for all the words that it can replace with suitable synonyms or substitutes. Every replaced word will appear bold and highlighted in a colorful text. Clicking on the word will give you details such as original word or other suggestions, you also have an option to add your own word.  By clicking on the original word, you can go back to original.
If you are someone who is trying to have a proper understanding of the functionality of an article rewriter or a paraphrasing tool then you are at the right place. An article rewriter tool is a simple tool that can work both online or offline, depending on how it functions. An instant article spinner or a paraphrasing tool is an efficient yet very easy to use tool that understand and identifies the text you give it, then rewriting it for you. It enables you to get your article rewritten with no trouble. Any quality article spinner saves your time and the trouble of sitting in front of your computer for hours in an effort to write unique and quality content. However, article rewriter is only a tool that does exactly what you asks it to do that means it only rewrites the content you give it, you still can go through the rewritten content make any changes that might be needed. At times, a paraphrasing tool ends up rewriting an article that doesn’t make much sense and that’s why it’s essential to proofread before you use the content.
Imo it is not possible for google to detect properly spun content, it is not worth computing power it requires. They can do this using ngrams for example, but it is uses a lot of queries. And for example article spinner I coded beats this algo, so google cant detect that the content is spun. Manual spinning is also good but it takes more than 30 minutes per article. 
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