Keywords

Domain

Domain is any topic about which you want to build knowledge base

Document

These are indexed for intents, about the concept of domain

Terms

These are any words which are often used in the concept,domain. These are two types, Indicator and CounterIndicator

Concept

Usually these are well known building blocks of domain knowledge.

Intent

Intent is a purpose or indicates the type of knowledge or specific thing you want to learn about or know about.