essential
- Answer BASIC
- Answer CORE
- Answer IMPERATIVE
- Answer INHERENT
- Answer INNATE
- Answer INTEGRAL
- Answer INTRINSIC
- Answer KEY
- Answer MAIN
- Answer MUST
- Answer NECESSARY
- Answer NEED
- Answer NEEDED
- Answer NEEDFUL
- Answer SINEQUANON
- Answer STAPLE
- Answer VITAL
- Answer OILS
- Answer OIL
- Answer BASAL