Another word for opportunity which begins with 'S' is scope.
softening
The alternate name for pigs is swine
There are several examples of "s" words that are similar in meaning to "clever," but they do have different connotations associated with them. For instance, snark, which carries a somewhat negative meaning. On the other hand, sharp, has a much more positive meaning.
Although we can't post the actual 's' word on this site as it goes against the community guidelines, the word is generally used to refer to rubbish or poop. However, it is often used as an exclamation of shock or surprise.
Satanic
salary
that may be the name of an instrument in another language.
spring
Another word for opportunity which begins with 'S' is scope.
synopsis
Sort or Savor
Side-Street
sojourn
spousal
Substitute.
softening