The term 'NOT UP YET' can be solved by two crossword solutions: ABED and INBED. ABED is a four-letter word meaning 'to be in bed, ' while INBED is a five-letter word meaning 'to be lying in bed.' Both words are used to describe the state of being in bed, but the difference between them is that ABED implies that the person is still in bed, while INBED implies that the person is already lying down in bed.