noun
BAD : I don't care what they say, as long as I get a respond.
GOOD : I don't care what they say, as long as I get a response.
BAD : We're still waiting for them to response.
GOOD : We're still waiting for them to respond.
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Respond is a verb: 'I'm surprised they responded so quickly.'
Response is a noun: 'I'm surprised we got such a quick response.' 'In response to your last comment, I'm afraid I don't agree.'