DS had a gap the other day. He didn't know the term "spelling pattern" i.e. the pattern of consonants and vowels in a word. This caused him to get half of a worksheet wrong. I'm not sure why the teacher didn't just tell him the definition, because that was all it took for him to "get" the concept and fix the worksheet.

Also, it seemed somewhat irrelevant since he already knew how to spell all those words anyway...

Still, his teacher makes much of such gaps. I suppose it's because it's an inconvenience to her to define terms?