The term ANTIS can be broken down into five crossword solutions: NOS (3 letters), NAYS (4 letters), NOES (4 letters), REBELS (6 letters), and OPPOSINGGROUP (13 letters). NOS is an abbreviation for 'NO one' or 'NOBODY, ' while NAYS and NOES are both synonyms for 'NO.' REBELS implies someone who is actively resisting authority, and OPPOSINGGROUP suggests a group of people who are in opposition to something. All of these words are related to the concept of being against something, which is the definition of ANTIS.