Laggard and Slow-moving

Laggard adjective - Moving or proceeding at less than the normal, desirable, or required speed.

Slow-moving and laggard are semantically related In some cases you can use "Slow-moving" instead an adjective "Laggard".

Slow-moving adjective - Moving slowly.

Laggard and slow-moving are semantically related in loose topic. You can use "Laggard" instead an adjective phrase "Slow-moving", if it concerns topics such as slow, inactive, casual, unhurried.