Calculate, Compute, Calculus, Calculator.
Some fun words that start with C are:cakecan docarnivalcarouselcelebrationcheerleaderscheeseburgerchoicescontestscookiescupcakecycling
Some nice words that begin with C are:carecaresscarnationcleanclearcomfortcompletecozycucumbercuriosity
constant circumfrence circuit cycle coset
Some five letter words that start with M and end with C are music, magic, and manic.
calculus, correlation, covariance, column, circle, circumference, cone, cube, cosine, cosecant, chi-square, commutativity, coordinate are some.