Here is how this week's words should be sorted:
gu- -gue -g oddball
guess tongue ladybug gauge
guard vague zigzag language
guitar league shrug argue
guide fatigue iceberg
guilty catalogue strong
guest dialogue
guidance plague
intrigue
synagogue
We noticed that gauge is an oddball because there doesn't appear to be a reason for the letter u in its spelling. Language is an oddball because the "gu" spelling sounds like /gw/, as opposed to just a hard g sound. Argue is an oddball because the u not only helps the g keep a hard g sound, but it also lends a long u sound to the word.