Beginning

Step 20:
Words where ‘ei’ can make an /ee/ sound 

caffeine, conceive, deceive, either, neither, perceive, protein, ceiling, receive, seize 

Developing

Stage 6 Step 1:
Words with the short vowel sound /i/ spelled ‘y’ 

antonym, crystal, lyrics, mystery, oxygen, rhythm, symbol, symptom, system, typical 

Mastery

Step 20: Words ending in ‘-er’, ‘-or’ and ‘-ar’ 

calendar, computer, customer, interior, particular, popular, radiator, shoulder, soldier, superior