My thesaurus lists stick or stab. The noun "lance" is related to spear.
"Spear" is another word for "lance" that starts with the letter "s."
Substitute.
Reserved.
"Spider" is a two-syllable word starting with "s."
"Sonorous" is a synonym for noisy that starts with the letter "s".
No, the word "summer" is not usually capitalized unless it is at the beginning of a sentence or as part of a proper noun.
slice, slash
Another word for opportunity which begins with 'S' is scope.
synopsis
Sort or Savor
Side-Street
sojourn
spousal
softening
Substitute.
stole
source spring square
The word beginning is an abstract noun, a word for the start of something.