This is about suffixes. Suffixes are added to the end of a word to change it a bit. For example, the suffix ful” in the back of “care” makes the word “careful”.

less: helpless careless colorless speechless
ness: happiness gentleness friendliness meanness
ful: playful blissful colorful peaceful hopeful
ment: engagement appointment commitment apartment
ation: appreciation exclamation quotation visitation
ian: guardian patrician politician
tion: satisfaction reflection collection addition attention
ive: detective respective relative perspective
ous: ridiculous wondrous monstrous tremendous humorous
ient: ancient
ial: memorial editorial
able: reliable admirable deniable regrettable controllable
est: happiest longest funniest

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