glare
stare
There are many words that can be used as a synonym for the word gaze. Some of the words include stare at, goggle at, gape at and so many more.
The word that is a synonym of "look hard" starting with S is "scrutinize."
That would be the word size.
look, gaze, stare, watch, examine
That word would be disaster.
start
smart
now ?
amble
docile
Wassailing