ob·struc·tion 
(əb-strŭkshən, ŏb-)
(əb-strŭkshən, ŏb-)n.
1. Something that obstructs; an obstacle: We drove around the obstruction in the road.
2.
a. The act of obstructing: The protesters' obstruction of the hallway made it impossible to get to the office.
b. The condition of being obstructed: The obstruction of the tunnel lasted for hours.
3. Sports The act of impeding another player in violation of the rules, as when a player impedes the progress of an opponent not in possession of the puck in ice hockey.
- Frederick the Great
- Frederick William
- Frederick William I
- Frederick William II
- Frederick William III
- Frederick William IV
- Frederick Winslow
- (Frederic) Ogden
- Fredericton
- Frederic William
- F(rederik) W(illem)
- free
- free agency
- free agent
- free-air correction
- free alongside ship
- free-associate
- free association
- freebase
- free-base
- freebaser
- freebee
- freebie
- freeboard
- freeboot