responsibility - duty, onus⏎
upsurge - sudden large increase⏎
zero hour - departure, beginning (of operation)⏎
zenith - summit, top, peak⏎
tender - bid, offer⏎
spec - specification, detailed description⏎
surplus - glut, superfluity, extra, more than is needed⏎
revamp - repair, improve appearance of⏎
sole - only, one⏎