Class vs Indexer – What’s the difference?

As nouns the difference between class and indexer is that class is (countable) a group, collection, category or set sharing characteristics or attributes while indexer is a person or program which creates indexes.

As a verb class is to assign to a class; to classify.
As an adjective class is (irish|british|slang) great; fabulous.

Program vs Indexer – What’s the difference?

As nouns the difference between program and indexer is that program is a set of structured activities while indexer is a person or program which creates indexes.

As a verb program is to enter a program or other instructions into (a computer or other electronic device) to instruct it to do a particular task.