"line" - key terms from Wikipedia

assembly line
avenue line
bakerloo line
blue line
central line
chorus line
circle line
clothing line
command line
cunard line
defensive line
digital subscriber line
district line
east london line
finish line
fixed line	operators
goal line
green line
jubilee line
line
line	of scrimmage
line	of succession
line	segment
line	up
load line
main line
metropolitan line
new line
new line	cinema
no line	on the horizon
piccadilly line
poverty line
power line
product line
purple line
rail line
red line
siegfried line
spectral line
straight line
tangent line
telephone line
thin blue line
thin red line
toy line
transmission line
tree line
walk the line
white star line
yellow line