"Key vocabulary" refers to the most important or essential words or terms that you need to know and understand in a particular context or subject. Full definition
It's 1 p.m. I have just given my sixth grade science class an assignment reviewing several concepts and key vocabulary words related to energy. (amle.org)
Here is a reading task, including key vocabulary for problems and future plans for students to do. (tes.com)
Game board enabling pupils to revise key vocabulary for the topic of Education and work. (tes.com)