superficial

determination

percussion

watchful

special, commercial facial spacial racial

intention superstition calcification combination certification

succession procession precession possession intercession

suspenseful careful awful forgetful wonderful helpful

emacial

action, partition, mutation, obliviation, destruction

fission, fusion,

Beautiful, wonderful, graceful,

cial: special, facial, financial, official, beneficial

tion: nation, fraction, dictation, initiation, lactation

ssion: mission, fission, possession, session, depression

ful: bashful, thankful, helpful, wishful, grateful

Superficial

appreciation

succession

wonderful

2. special, financial, glacial, judicial, facial

3. fiction, inspiration, condition, position, satisfation

4. concession, possession, passion, obsession, compassion

5. bountiful, beautiful, mouthful, harmful, handful

***Addition after reading other answers, esp. the lesson about suffixes***

It’s just words and wordplay, no biggie. ;-}