The term 'Fill with a Spirit' can be summarized by the crossword solution 'ensoul, ' which is a six-letter word. The term 'ensoul' means to fill something with a spirit or soul, often in a spiritual or religious context. It is derived from the Latin word 'insolare, ' which means to endow with a soul. In some religions, ensoulment is believed to occur at the moment of conception, when a soul enters the body.