Archiving words has two main functions in Biblingo. One is that it will remove the word from any auto-generated review decks (in Words That Need Practice). The other is that the word will then count toward your percentage of known words in the Bible Reading module.
You can archive individual words in two ways:
From within a Words That Need Practice deck in the Association stage only:
From the Bible Reading module, in the Dictionary pane:
You can also Bulk Archive words at and above a specific frequency (e.g. words that occur 50 times or more in the OT/NT). NOTE: the Bulk Archive function CANNOT be undone - use cautiously. This can be done from the Bible Reading module: