great
Nice.
The element that is a good conductor that begins with the letter S is Selenium. Another choice could be Scandium.
In some contexts the word exemplar would have that meaning.
good?
Great. As above it could be "Great" or you can say Grand. It really depends on what phrase your going to use it in like "I'm doing great" or "I"m grand". There really aren't very many definitions for good that also start with the letter G.
good
Exceptional
quota
beneficial
har,
Munching on good food.
nerdnightname