Prefix
con - with, together
de - away, down
infra - beneath
ob - against
re - back, again

Root
struct - build

Suffix
-ion - state, quality, act
-ure - process, condition

Words and Definitions
construct - to form by putting together parts
destruction - the act of destroying; a state of damage
infrastructure - underlying framework of a system
obstruction - an obstacle or something put up against something else
reconstruction - the act of putting back together