Cursor-over Words floating definition pop up

Describe the use case
Allowing users to hover over certain words instead of linking out to understand the definition.

Describe the problem
Currently, it's a hyperlink rabbit hole for reading definitions of well-defined vocabulary words.

Proposed Solution
Implement a mouse-over feature that lists the definition of certain well-defined words like smart contracts, blockchain, etc.

Create a feature where we can highlight specific words on the curriculum with a mouse hover.

See picture:

Navigation Menu