noun, の adjective
The versus phenomenon is what you're going up against. It's your target because you're heading towards this phenomenon you're versusing against.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
Employees who work for this company for thirty years are subject to two straight weeks off with full pay as a reward for their many years of service to the company.