Mischievous is spelled as shown here, instead of the commonly written (and mispronounced accordingly) mischievious. It’s pronounced “miss-chuh-vuhs” and should be spelled with only two i’s.
No one is always two words.
Cannot is one word.
Relevant is often misspelled as revelant.
Prerogative should not be misspelled or mispronounced as “perogative.”
Print a comprehensive list and place it next to your computer as a reference for your next paper.