'essential'はこちらの項目にも見つかりました。
英語の見出し語に対する説明:
ancillary
- bare bones
- basic
- biogenic
- cardinal
- compelling
- core
- crucial
- dehydrate
- discretionary expense
- dispensable
- distillation
- distilled
- extraneous
- extrinsic
- fundamental
- gut
- hypostasis
- important thing
- indispensable
- it is necessary
- it is necessary to
- key information
- key qualification
- luxury goods
- luxury tax
- making
- matter of necessity
- mission-critical
- must-have
- necessary
- nonbasic
- noncritical
- nude
- pith
- primordial
- property
- quick
- quiddity
- quintessence
- spirit
- vital