Term: rarefaction: a decrease in the density of something
Broader: concentration: increase in density | Unrelated: dick: someone who is a detective
Broader: concentration: increase in density | Unrelated: elysium: (Greek mythology) the abode of the blessed after death
Broader: concentration: increase in density | Unrelated: strawberry jam: made with strawberries
Broader: concentration: increase in density | Unrelated: monotreme: the most primitive mammals comprising the only extant members of the subclass Prototheria
Broader: concentration: increase in density | Unrelated: hydrophidae: sea snakes
Broader: concentration: increase in density | Unrelated: shock: an instance of agitation of the earth's crust
Broader: concentration: increase in density | Unrelated: heater: device that heats water or supplies warmth to a room
Broader: concentration: increase in density | Unrelated: civic leader: a leader in municipal affairs
Broader: concentration: increase in density | Unrelated: parisienne: a female native or resident of Paris
Broader: concentration: increase in density | Unrelated: coyol: tropical American palm having edible nuts and yielding a useful fiber