This is the 4681st most frequent Turkish word.
büyükelçi
Ambassador.
In this sentence, 'büyükelçi' is used as a noun to refer to a diplomatic representative of a country.
Büyükelçi, yurtdışındaki Türk vatandaşlarına yardım etti.
The ambassador helped Turkish citizens abroad.
Here, 'büyükelçi' functions as a subject noun describing a person in an official diplomatic role.
Yeni büyükelçi görevine başladı.
The new ambassador assumed their position.
In this case, 'büyükelçi' is used generically to signify the profession or role.