Week 1 

Step 1: Words that are homophones

accept, except, knot, not, peace, piece, plain, plane, weather, whether

Week 2 

Step 2: Words with the prefix ’in-’ meaning ‘not’

inability, inactive, inadequate, incorrect, incurable, indefinite, inelegant, inflexible, insecure, invisible

Week 3 

Step 3: Words with the prefixes ’il-’, ‘im-’ and ‘ir-’

illegal, illegible, immature, immortal, impossible, impatient, imperfect, irregular, irrelevant, irresponsible

Week 4

Step 4: Words with the prefix ’sub-’ meaning ‘below’ or further divided

subdivide, subheading, subject, submarine, submerge, submit, substandard, subtitle, subtropical, subway

Week 5 

Step 5: Words with the prefix ’inter-’ meaning ‘between or among’

interact, intercept, interchange, intercity, intercom, interface, interfere, international, internet, interview

Week 6 

Step 6: Challenge Words

strength, grammar, calendar, women, appear, straight, interest, opposite, increase, believe