The term 'HOST AT CHURCH, SAY' can be solved by the crossword solution 'WAFER'. A WAFER is a thin, flat, round piece of unleavened bread that is used in religious ceremonies, such as the Eucharist. It is typically made from wheat flour and water, and is often used to represent the body of Christ in the Catholic Church. In some Protestant denominations, it is also used to symbolize the presence of God in the congregation.