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The noun forms for the verb to conceive are conceiver, concept, conception, and the gerund, conceiving.
That is the correct spelling of "conceive".
Believe, grieve, reprieve, receive, leave, sleeve.
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 7 words with the pattern ---C-I--R. That is, nine letter words with 4th letter C and 6th letter I and 9th letter R. In alphabetical order, they are:
conceiver
describer
flaccider
inscriber
perceiver
practicer
practiser