Side-Street
Another word for opportunity which begins with 'S' is scope.
synopsis
Sort or Savor
sojourn
spousal
softening
Substitute.
stole
source spring square
"Spear" is another word for "lance" that starts with the letter "s."
The phonemes in the word "street" are /s/, /t/, and the r-controlled vowel /iː/.
The word beginning is an abstract noun, a word for the start of something.