Behind and Retral

Behind adjective - Not arriving, occurring, or settled at the due, usual, or proper time.

Retral and behind are semantically related In some cases you can use "Retral" instead an adjective "Behind".

Retral adjective - Moving or directed or tending in a backward direction or contrary to a previous direction.

Behind and retral are semantically related in back topic. Sometimes you can use "Behind" instead an adjective "Retral", if it concerns topics such as rear.