act - action, decide - decision, invent - invention, express - expression, permit - permission, conclude - conclusion, operate - operation, confess - confession, discuss - discussion, expand - expansion, divide - division, collide - collision, propose - proposition, convert - conversion, suspend - suspension, revise - revision, proceed - procession, compress - compression, explode - explosion, describe - description,

Base word to suffix '-sion' and '-tion'

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