echo-, ech- (Greek: sound, noise; especially a returned sound; repetition, imitation).anecho: 
anechoic: 
catecheses (plural): 
catechesis (singular): 
catechetical: 
catechism: 
catechist: 
catechization: 
catechize: 
catechizing: 
catechumen: 
echo: 
echoacousia: 
echoacusis: 
echocardiogram: 
echocardiograph: 
echocardiography: 
echoed: 
echoencephalography: 
echoes: 
echoesis: 
echogenic: 
echogram: 
echograph: 
echographer: 
echographia: 
echography: 
echoic: 
echoism: 
echokinesia: 
echokinesis: 
echolalia: 
echolocation: 
echomimia: 
echomotism: 
echopathy: 
echophonia: 
echophony: 
echophotony: 
echophrasia: 
echopraxia: 
echoscope: 
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