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spond-, spon-, spons-, -spondence, -spondent, -spondency, -spondencies (Latin: bind oneself; promise, pledge).


correspond:
correspondent:
despond:
despondent:
espouse:
irresponsible:
reposte:
respond:
response:
responsible:
responsive:
sponsor:
sponsorship:
spontaneous:
spontaneously:
spouse: