S: (n) Milk (milk%1:17:00::), Milk River (milk_river%1:17:00::) (a river that rises in the Rockies in northwestern Montana and flows eastward to become a tributary of the Missouri River)
S: (n) substance (substance%1:03:01::) (a particular kind or species of matter with uniform properties) "shigella is one of the most toxic substances known to man"
S: (n) matter (matter%1:03:00::) (that which has mass and occupies space) "physicists study both the nature of matter and the forces which govern it"