интерес

From LSJ

πενία μόνα τὰς τέχνας ἐγείρει → poverty alone promotes skilled work, necessity is the mother of invention, necessity is the mother of all invention, poverty is the mother of invention, out of necessity comes invention, out of necessity came invention, frugality is the mother of invention

Source

Russian > Greek

σύμφορον, ὠφέλεια, ὠφελία, ὠφελίη