The crossword solutions for the term 'NECESSARY AS A PART' are 'INHERENT' and 'INTEGRAL'. INHERENT means existing in something as a permanent, essential, or characteristic attribute. It is an adjective that describes something that is part of the essential nature of something and cannot be separated from it. INTEGRAL means necessary to make a whole complete. It is an adjective that describes something that is essential to the completeness of something else.