Essential and Nucleus

Essential noun - Something necessary, indispensable, or unavoidable.

Nucleus and essential are semantically related. In some cases you can use "Nucleus" instead a noun "Essential".

Nearby Words: essence, essentially, essentiality

Nucleus noun - A thing or place that is of greatest importance to an activity or interest.

Essential and nucleus are semantically related. Sometimes you can use "Essential" instead a noun "Nucleus".

Nearby Words: nuclear, nucleic