The term 'be sufficient' can be expressed in two-letter, four-letter, and six-letter words. The two-letter word is 'DO', which means to perform an action or task. The four-letter word is 'enow', which is an archaic form of the word 'ENOUGH'. The six-letter word is 'ENOUGH', which means having a sufficient quantity or degree. All three words express the idea of having ENOUGH of something to meet a requirement or expectation.