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
The correct spelling of the word is "believing."
spell the word bac right.
That is definitely not right. It is difficult even to guess what you were trying to spell, possibly bronchial spasm.
The likely word is "maximum" (highest possible level). A similar word is "maxim" (a wise saying or principle).
No, you are possibly thinking of the word "voluptuous".
Those letters will spell umbrella.
You actually spelled it right! Good job. That's a hard word to spell.