Behind and For

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

For is a synonym for behind in supporting topic. In some cases you can use "For" instead a preposition "Behind", when it comes to topics like over, since, beside, by.

For conjunction - For the reason that.

Behind is a synonym for for in over topic. You can use "Behind" instead a preposition "For", if it concerns topics such as since, beside, by, to.