der Deutschlehrer
German teacher
A male person whose job is to teach the subject German at a school or in courses.
Unser neuer Deutschlehrer legt viel Wert auf korrekte Grammatik.
Our new German teacher places a lot of importance on correct grammar.

German teacher
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German teacher
A male person whose job is to teach the subject German at a school or in courses.
Unser neuer Deutschlehrer legt viel Wert auf korrekte Grammatik.
Our new German teacher places a lot of importance on correct grammar.

The word is made up of 'Deutsch' (German, the school subject) and 'Lehrer' (teacher). This pattern also works for other subjects, e.g. 'Mathelehrer' (math teacher), 'Englischlehrer' (English teacher), or 'Sportlehrer' (PE teacher).
Mein Lieblingslehrer war der Geschichtslehrer.
My favorite teacher was the history teacher.
The word 'Lehrer' (teacher) belongs to the word family of 'lehren' (to teach). A teacher is therefore a person who teaches other people something.
Ein guter Lehrer kann komplizierte Dinge einfach lehren.
A good teacher can teach complicated things simply.
To express that someone does this job, you often use the construction 'arbeiten als' (to work as) or simply the verb 'sein' (to be).
Er arbeitet seit fünf Jahren als Deutschlehrer.
He has been working as a German teacher for five years.
teacher
'der Lehrer' and 'der Deutschlehrer' both refer to people who teach. 'der Lehrer' is more general: he can teach any subject, for example math, sports, or German. 'der Deutschlehrer' is more specific and means a teacher for the subject German or for German courses. The words can be confused when you only want to say that someone teaches. If the subject is important, you say 'Deutschlehrer'. If the subject is not important or is unknown, 'Lehrer' is enough.

In der Pause fragt Ali den Deutschlehrer nach einem guten Wörterbuch.
During the break, Ali asks the German teacher about a good dictionary.
Unser neuer Lehrer kommt nächste Woche zum ersten Mal in die Klasse.
Our new teacher is coming to the class for the first time next week.