The couple were diving with a friend who is a qualifiedinstructor.
Times, Sunday Times (2014)
He became a qualifiedinstructor and was proud that he introduced more than 800 people to gliding.
Times, Sunday Times (2011)
Definition of 'instructor'
instructor
(ɪnstrʌktəʳ)Explore 'instructor' in the dictionary
countable noun [oft noun NOUN]
An instructor is someone who teaches a skill such as driving or skiing. In American English, instructor can also be used to refer to a schoolteacher or to a university teacher of low rank.