The term 'REALLY ANNOY' can be broken down into six crossword solutions: HARASS (6 letters), IRK (3 letters), VEX (3 letters), RILE (4 letters), PEEVE (5 letters), and EATAT (5 letters). All of these words are synonyms for the term 'ANNOY, ' and they all refer to the act of causing distress or irritation. HARASS is the most intense of the words, meaning to subject someone to persistent attacks or criticism, while IRK and VEX are more mild, referring to the act of irritating or annoying someone. RILE and PEEVE are similar in meaning, referring to the act of making someone angry or annoyed. Finally, eatat is a slang term meaning to bother or ANNOY someone.