Spouse is probably the one you're looking for.
Another word for opportunity which begins with 'S' is scope.
an alliteation is a word in a sentence which have the same beginning word example.. she sings sweetly.. (s,s,s)
sop
start
synopsis
Subway
sadisticsarcasticsardonicsatanicscenicscientificshellacsimplisticseismographicskepticsociopathicsporadicsoporificspasticspecificstoicstaticsumacsystematicsyllabicsymbolicsymphonicsystemic
The first word beginning with 's' in most dictionaries is usually "sad."
scale
People shout:StopShut upSurprise
Side-Street
Substitute.