Essential and Primitive

Essential adjective - Of or relating to the simplest facts or theories of a subject.

Primitive and essential are semantically related in surface topic. In some cases you can use "Primitive" instead an adjective "Essential", when it comes to topics like basic.

Nearby Words: essence, essentially, essentiality

Primitive adjective - Belonging to or characteristic of an early level of skill or development.

Essential and primitive are semantically related in surface topic. Sometimes you can use "Essential" instead an adjective "Primitive", if it concerns topics such as ancient.

Nearby Word: primitively