The term 'REALLY, REALLY WANT' can be expressed in three different ways using crossword solutions. The first is 'COVET', which means to strongly desire something that belongs to someone else. The second is 'CRAVE', which means to have an intense longing or yearning for something. The third is 'ACHEFOR', which means to feel a deep emotional longing for something. All three words express a strong desire for something, and can be used to describe the phrase 'REALLY, REALLY WANT'.