This is a rather big post that currently cannot fit on the site, but if you're in the LambdaGeneration discord, I can redirect you to the post here: discord.com/channels/46155643490… I've compiled a massive spreadsheet of all* of the Combine terminology used in the games and their uses/definitions based on thorough investigation by several parties and various resources. If HL lore and the Combine interest you as much as it interests me, you might like to check this out.