The term 'REALLY BUGS' can be solved by the crossword solutions PESTERS (7 letters), IRKS (4 letters), and EATSAT (6 letters). PESTERS refers to a person or thing that annoys or irritates someone, while IRKS means to cause annoyance or frustration. Finally, EATSAT is an acronym for the Examination of Academic Skills Test, which is a standardized test used to measure academic skills in students. All three words are related to the term REALLY BUGS, as they all refer to something that can be annoying or irritating.