Cspan rhymes with:
span, spann, chapin, dupin, harpin, japan, lapan, lappin, maupin, pan, span, spann
Cspan sounds like:
c-span, caban, cabana, cabin, cacophony, caffeine, capano, capen, capon, capone, caponi, capuano, caspian, cauffman, cavan, cavanah, caveman, caven, cavin, chabon, chaffin, chafin, chapin, chapman, chauvin, chavin, cheapen, cheekbone, chiappone, chiffon, chipman, chopin, chovan, cobain, cobaine, coben, cobian, cobin, coffeen, coffin, coffman, coopman, copeman, copen, coppin, coupon, coven, coveney, covin, covina, covino, cuban