The Greek word for "camel" is Kamelos, whereas the word for "rope" is Schoinion
I looked it up:
http://www.biblicalhebrew.com/nt/camelneedle.htm
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Another possible solution comes from the possibility of a Greek misprint. The suggestion is that the Greek word kamilos ('camel') should really be kamĂȘlos, meaning 'cable, rope', as some late New Testament manuscripts actually have here.

