There is a lot of tossing around of the term "such and such ministry" in the Catholic Church, on the level of the laity.
Fr. G has pointed out to me that this is rather incorrect, (outside of sacramental ordination?)
Someone else can sort out the exact terminology or whatever; it seems to be a distinction between a role or office, rather than a ministry, but here's the applicable document:
and some relevant excerpts from 23:
"a person is not a minister simply in performing a task, but through sacramental ordination."
"...In the same Synod Assembly, however, a critical judgment was voiced along with these positive elements, about a too-indiscriminate use of the word "ministry"...Precisely to overcome these dangers the Synod Fathers have insisted on the necessity to express with greater clarity, and with a more precise terminology..."