second - time, kilogram - ?

MASS

Word	Clue
ACRE	kilogram - pound, hectare - ?
INCH	kilogram - pound, centemetre - ?
MILE	kilogram - pound, kilometre - ?
TIME	kilogram - mass, second - ?
UNIT	kilogram or hertz
YARD	kilogram - pound, metre - ?
FRAME	for picture or time
LITRE	pound - kilogram, gallon - ?
METER	time - second, distance - ?
METRE	pound - kilogram, yard - ?
MONTH	unit of time dividing the year
POUND	metre - yard, kilogram - ?
RUMBA	4 time
GALLON	kilogram - pound, litre - ?
SECOND	mass - kilogram, time - ?
HECTARE	pound - kilogram, acre - ?
DISTANCE	second - time, meter - ?
KILOGRAM	time - second, mass - ?
KILOMETRE	pound - kilogram, mile - ?
CENTEMETRE	pound - kilogram, inch - ?
NATURE	second or human
DISTANCE	second - time, meter - ?