Circ- Circum-
Circ- Circum- means round, around

circle (n) - a round shape that has no beginning or end

circlet (n) - a small circle; a ring or round band worn as an ornament, especially on the head

circuit (n) - a path for an electrical current to flow around

circulate (v) - to move around an area or a place, often returning to a starting point

circumference (n) - the distance all the way around a circle

circumflex (adj) - bending around; curved

circumnavigate (v) - to go completely around

circumrotate (v) - to turn around like a wheel

circumspect (adj) - careful; careful to look all around before doing something

circumvent (v) - to prevent something from happening by careful thinking; to get around something; to entrap