presumption - supposition⏎
pursue - follow, chase up⏎
require - need, necessitate, fall short⏎
optimal - best, most likely to succeed⏎
payback - reward, advantage, return, just desert⏎
proposal - plan, request, intention, formal suggestion⏎
presentation - speech, show, formal introduction⏎
plummet - plunge, founder, fall suddenly⏎
parcel - package, apportion, piece⏎
prohibit - stop, prevent, restrain, bar, ban⏎