Yes, "highest" is the correct spelling.
That is the correct spelling of "ultimatum" (a coercive threat).
You have it right.
It looks like you are trying to spell the word pinnacle. Pinnacle is a noun referring to a highest point.
Yes, you did. It is spelled right.
varanda
That is definitely not right. It is difficult even to guess what you were trying to spell, possibly bronchial spasm.
spell the word bac right.
Those letters will spell umbrella.
Believing is right
No, you are possibly thinking of the word "voluptuous".
The likely word is "maximum" (highest possible level). A similar word is "maxim" (a wise saying or principle).
First you have to spell the word right.