Upvote:3
EDIT: As of this annoucement, some parts of this answer are out of date. I'll keep it as it is now though for historical purposes.
Teachers usually do not teach on Sunday (unless assigned to teach a class), but are assigned as home teachers.
All teachers are assigned one or more families to home teach. A new teacher is usually assigned a more experienced Priesthood holder (such as an Elder or High Priest) to mentor them, but they usually give the lesson half of the time. (This lesson could be considered a "lecture"). For example, in the New Era (a magizine for the youth of the Church), in Watching over the Church
One of the most important parts of a successful home teaching visit is preparing and sharing a lesson. Every other month Brandon Stewart gives the lesson. Brandon has learned how to prepare a lesson by watching his senior companion, his father. Thanks to his dadβs good example, giving the lesson is Brandonβs favorite part of home teaching.
They might even create the lesson themselves (under the direction of the older Priesthood holder), although usually they do not. Home teachers also have other duties, which can be said to be "teaching by example", although I guess you would consider this more "abstract".
Some teachers are also assigned as the president of a teacher's quorum (in particular, one per quorum). This will usually be a 14 or 15 year old. They also might teach (in particular, they would teach other teachers), again under the direction of older priesthood holders.
It should be noted as well than any member can be assigned to give a talk on Sunday.
Is a teacher in the Aaronic teacher the same as college professors? Sadly no. Do they teach? Yes.