The term 'BASIC CHANGE' can be broken down into two crossword solutions: 'ONES' (4 letters) and 'BASIC' (5 letters). 'ONES' is a plural noun that refers to a single unit or individual, while 'BASIC' is an adjective that describes something as fundamental or essential. Together, the two words form the phrase 'BASIC change, ' which can refer to a fundamental alteration or transformation in a person, situation, or system.