vital part

condition element essence fundamental must precondition prerequisite principle requirement requisite

ABCs groceries guts heart nitty-gritty quintessence rudiment stuff substance

bottom line brass tacks fire and ice meat and potatoes name of the game nuts and bolts part and parcel sine qua non where one's at

extra

accessory auxiliary nonessential subsidiary throwaway

essential fundamental obligation precondition prerequisite requirement urgency

call cause claim compulsion demand desideratum duress essence exaction exigency godsend imperative indispensability inevitability inexorableness must must-have necessary pinch privation requisite stress vitals want

life or death needfulness no alternative no choice sine qua non undeniability

auxiliary extra trivia

desire

concern condition demand need obligation precondition prerequisite provision qualification specification stipulation

claim compulsion desideratum element engrossment essential exaction exigency extremity fulfillment fundamental imperative lack must obsession pinch preliminary preoccupation prepossession prescription proviso requisite stress terms urgency want

abundance auxiliary extra indifference lot nonessential plenty trivia

claim compulsion concern condition demand desideratum element engrossment essential exaction exigency extremity fulfillment fundamental imperative lack must need obligation obsession pinch precondition preliminary preoccupation prepossession prerequisite prescription provision proviso qualification sine qua non specification stipulation terms urgency

desire option wish