Amateur Something or someone that is amateur is non-professional. If you remember that amateur ends in a fancy French suffix (-eur), you’ll be able to spell this word correctly in both professional and non-professional situations.
Conscientious Conscientious means thorough, careful, or vigilant. If you have a strong conscience, you will be conscientious. You can remember the conscience by breaking it into “con” and “science.” Then the similarities between conscience and conscientious will help you remember the spelling for the latter.