Reply To: Spell Check – Can I tell InDesign that 2 separate words are actually 1 word?

The problem is that “ignored” is a temporary status. If you close the document and reopen, you'll have to ignore them all over again. Building a set of grep styles all pointing to the same character style is probably the way to go in a situation like this. Then I'd load the text styles from the first (master) document so I could reuse them for new documents with the same product names.