U5L5 Which Term Doesn't Belong?

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Across
  1. 2. two letters that spell one sound
  2. 3. letters that match the phoneme
  3. 5. syllables with one vowel followed by a consonant
  4. 7. you have two on your face
Down
  1. 1. three letters that spell one sound
  2. 4. letter sounds
  3. 6. syllables that end with only one vowel, long sound