This is the 7780th most frequent Russian word.
инженер
Engineer.
The word 'инженер' is used in the instrumental case to indicate a profession.
Мой брат работает инженером на строительстве.
My brother works as an engineer in construction.
The word 'инженеры' is used in the plural nominative case for general reference to the profession.
Инженеры проектируют сложные системы для зданий.
Engineers design complex systems for buildings.
Here, 'инженером' is used in the instrumental case in a subordinate conjunction sentence.