instructor:
(plural: ‘instructors‘; female: (old usage) ‘instructress‘ pronunciation: the letter ‘i’ rhymes with the letter ‘i’ in “ink” —- for the right pronunciation, please click here)

a golf instructor (R) giving instructions to a learner (L)
a person who instructs;
a person who teaches an activity,
a teacher; a coach;
a person who holds the lowest teaching rank at an American and Canadian University or college,

a martial arts instructor giving instructions to his martial arts students
My gym instructor is an awfully sweet person, takes a lot of trouble giving us her best!
There are different types of instructors: ‘physical education instructors’, ‘tennis instructors’, ‘flying instructors’, ‘boxing instructors’, ‘swimming instructors’, etc.
Some driving instructors seem to have no idea how to handle their students, especially the young students.
The nursing instructors need to be kind and cooperative because the job a nurse in itself scares some soft-hearted candidates and during the training, when the young nurses encounter authoritarian instructors, they are more scared and the feeling stays with them for ever.

an (academic) instructor checking his senior students’ work
for an article that talks about flight instructors, please click here,
to know the difference between a facilitator and instructor (academics), please click here
and
for an article that explains what a driving instructor is, please click here.
