Homophones and near homophones (Words that sound the same but are spelt differently)
there, their, they’re, here, hear, see, sea, to, too, two
Words ending in the suffix -al
natural, occasional, actual, accidental, medical, national, capital, vocal, sensational, personal.
Adding the suffix -ous (No change to root word)
dangerous, poisonous, mountainous, joyous,