Proceeding smoothly is a phrase that is often used to describe a situation in which everything is going well and without any major issues. This phrase can be broken down into two words, 'FLOW' and 'HUM, ' which are both four and three letters respectively. FLOW is defined as the continuous movement of something, while HUM is defined as a low, steady sound. Together, these two words can be used to describe a situation in which everything is running smoothly and without any major disruptions.