Vocation is indeed a vocare. I did my first teacher training in a Catholic Teachers College and this word vocation was clearly emphasized.
Teaching is a calling and not for everyone who wishes to join the workforce and even to those with utmost level of professionalism.
It is a vocation(needs your heart, heart and mind and self giving) but also need the professionalism of the teaching profession.
At the end of the day it is not just a profession but what I am called to do, to be all things and give my best to the children that are entrusted to me.