This is the 13779th most frequent German word.
erfahrenen
Experienced.
'Erfahrene' here is used as an adjective describing the teacher, indicating that he is skilled or knowledgeable due to experience.
Der erfahrene Lehrer erklärte die komplizierte Grammatik verständlich.
The experienced teacher explained the complicated grammar clearly.
'Erfahrenen' is used here as an attributive adjective modifying 'Kollegen', showing these colleagues have substantial experience in their field.
In ihrem neuen Job hat sie viel von den erfahrenen Kollegen gelernt.
In her new job, she has learned a lot from the experienced colleagues.
'Erfahrenen' serves as a descriptive adjective for 'Bergführer', emphasizing the guide's deep knowledge and expertise in about mountains and safety.