A sacrament is a means of grace which belongs to the church.
An ordinance is a sign or evidence of grace.
When we participate in baptism, the Lord’s Supper, or perhaps certain other activities, are these means of grace which the church administers or are these merely signs of things that the church carries out?
So what constitutes an ordinance or a sacrament?
It will typically be the Word of God conjoined with some sort of visible element.