Reader's Edition Interlinear... Popular Textbooks, Morph Data & Word Lists
The Reader's Edition Interlinear can "Hide words according to frequency".
1) Hide words according to one's progress in popular grammar texts [example: "Basics of Biblical Greek - Chapter 11"].
2) Hide MORPH DATA linked to one's progress in such grammar texts [example: "Basics of Biblical Greek - Chapter 11 - 1st/2nd Person Personal Pronouns"].
3) Hide words according to a 'Word List', made by the user and continually growing. [Example: If multiple filters were select-able, users could function at a lower level , but still hide the more advanced words they happen to know.]