Could you please tell me if the questions are grammatically correct? Thank you very much.

1) What does the word “rub” denote and connote?
Why does Hamlet arrange a play at court? What is the function of the “play within the play”?
2)Whose ghost appears to Hamlet? Why? How does the play end?
3) What did the Latin statement “quietus est” refer to? Why does Hamlet refer to it (I need a synonym of "refer"?
4) How does Hamlet regard courage and cowardice respectively?
Can Shakespeare’s Hamlet be regarded as a revenge tragedy? Why? What are the main features of a revenge tragedy?
5) From which perspectives does Hamlet consider death in his famous soliloquy “To Be or not to Be”?

1 answer

All are fine.

http://thesaurus.com/browse/refer
I'd stick with "refer," but it you must replace it, then use either "allude to it" or "point it out."