Sometimes you know that the page you seek is out there, but you can’t find it. You’ve tried searching for all the relevant keywords you can think of, but the page must be using different words.
That’s when Google’s synonym operator comes into its own. Just prefix a word with a tilde (~) and Google will search for the synonyms that it knows about.
So, for example, a search for ~earth will find pages about world in addition to those about earth.
You can put the synonym operator in front of more than one search term if you like, but it doesn’t work in front of quoted phrases.
Google sometimes searches for very close synonyms without asking, but the synonym operator makes it use a fairly broad range. For example, Google’s synonyms for garden include plant and landscaping, synonyms for car include BMW, automobile, motor etc.
(photo by Bjarne Kvaale)