a teacher or speech teacher
A synonym for silvery would be metallic.
succeed, replace, outmode
Which of these words could be a synonym for hero?
It depends a bit on context. In a sentence where you ask about someone's technical capacities like: 'are you able to operate this", a synonym could be 'are you capable of operating this'. In a more general sense, you would replace 'are you able to...' simply with: 'can you....'.
Sleeping could be a possible synonym.
Could have,can,could
A synonym for core could be middle or center.
A synonym for coastal could be sea side.
No but cuddly would be a synonym.
The answer to the question above could be equivalent
No, playful is a synonym for frisky, but not for risky. A synonym for risky could be perilous.
The synonym of terrorist is - radical, rebel, incendiary.