words ending in astic

2 Syllables
clastic, drastic, mastic, plastic, spastic

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3 Syllables
bombastic, dynastic, elastic, fan-tas-tic, fantastic, gymnastic, monastic, sarcastic, scholastic
4 Syllables
inelastic, paraphrastic, periphrastic, thermoplastic
5 Syllables
ecclesiastic, encomiastic, enthusiastic