Comparing completion percentages of quarterbacks Kirk Cousins and Case Keenum over three seasons (2015-17) on various routes:

Comeback

Cousins: 54.7. Keenum: 45.7. NFL average: 52.7. NFL best: 67.2. Cousins TD/INT: 0/1. Keenum TD/INT: 3/1.

Corner

Cousins: 44.4. Keenum: 36.7. NFL average: 39.7. NFL best: 57.4. Cousins TD/INT: 11/1. Keenum TD/INT: 7/1.

Cross

Cousins: 71.0. Keenum: 74.7. NFL average: 67.0. NFL best: 80.0. Cousins TD/INT: 5/5. Keenum TD/INT: 3/0.

Curl

Cousins: 81.3. Keenum: 66.4. NFL average: 72.7. NFL best: 81.3. Cousins TD/INT: 2/4. Keenum TD/INT: 1/4.

Flat

Cousins: 83.6. Keenum: 80.5. NFL average: 79.4. NFL best: 86.0. Cousins TD/INT: 9/1. Keenum TD/INT: 3/1.

Go

Cousins: 34.6. Keenum: 38.2. NFL average: 35.2. NFL best: 50.2. Cousins TD/INT: 20/5. Keenum TD/INT: 1/2.

In

Cousins: 57.3. Keenum: 70.0. NFL average: 64.2. NFL best: 75.9. Cousins TD/INT: 1/7. Keenum TD/INT: 0/1.

Out

Cousins: 68.2. Keenum: 63.7. NFL average: 64.3. NFL best: 73.6. Cousins TD/INT: 8/3. Keenum TD/INT: 2/2.

Post

Cousins: 57.7. Keenum: 50.0. NFL average: 53.7. NFL best: 67.0. Cousins TD/INT: 9/5. Keenum TD/INT: 7/3.

Slant

Cousins: 67.0. Keenum: 75.0. NFL average: 65.7. NFL best: 77.9. Cousins TD/INT: 13/4. Keenum TD/INT: 2/2.

Under screen

Cousins: 90.6. Keenum: 75.6. NFL average: 79.9. NFL best: 94.1. Cousins TD/INT:  2/0. Keenum TD/INT: 1/0.

WR screen

Cousins: 86.8. Keenum: 86.5. NFL average: 88.9. NFL best: 97.4. Cousins TD/INT: 1/0. Keenum TD/INT: 1/1.

Receiver routes

Sportradar breaks down every throw into 12 different routes, and here’s a brief description of each:

Comeback: Receiver sprints downfield, then stops and comes back toward the quarterback or sideline.

Corner: After running down the field, receiver breaks off route at an angle toward the sideline. (Sportradar counts fade routes in the end zone as corner routes).

Crossing: Receiver starts his route at an angle toward the middle of the field and continues running across the field. Sometimes called a drag route when done close to the line of scrimmage.

Curl: Receiver sprints, stops, then turns back toward the quarterback. Usually shallower than a comeback route.

Flat: When a receiver (usually a running back) heads toward the sideline close to the line of scrimmage.

Go: Receiver sprints down the field, typically in a straight line.

Out: After running straight, the receiver breaks off the route at a 90 degree angle toward the sideline.

In: After running straight, the receiver breaks off the route at a 90 degree angle toward the middle of the field. Also called a dig route.

Post: When a receiver runs deep downfield and then angles the route toward the middle of the field.

Slant: When a receiver runs a few yards then angles the route toward the middle of the field.

Underneath screens and wide receiver screens: When a pass receiver catches the ball near the line of scrimmage with blocking set up in front of them. Underneath screens often go to a running back.

Source: Sportradar