mass - kilogram, distance - ?

METER

List of words for the clue mass - kilogram, distance - ? from the crossword:

METRE TIME SECOND UNIT MILE INCH KILO YARD WAVE TRAM SIGHT CAKE POUND LITER AFAR TONNES LITRE KILOMETRE KILOCALORIE

Word	Clue
WEE	short time or short distance
ACRE	kilogram - pound, hectare - ?
CALL	telephone or long-distance
INCH	kilogram - pound, centemetre - ?
MASS	meter - distance, kilogram - ?
MILE	kilogram - pound, kilometre - ?
TIME	kilogram - mass, second - ?
UNIT	kilogram or hertz
YARD	kilogram - pound, metre - ?
LITRE	pound - kilogram, gallon - ?
METRE	pound - kilogram, yard - ?
POUND	metre - yard, kilogram - ?
SECOND	mass - kilogram, time - ?
FARNESS	distance
HECTARE	pound - kilogram, acre - ?
DISTANCE	kilogram - mass, meter - ?
INTERVAL	distance in space
KILOGRAM	distance - meter, mass - ?
KILOMETRE	pound - kilogram, mile - ?
CENTEMETRE	pound - kilogram, inch - ?
BULK	mass, heap
SECOND	mass - kilogram, time - ?