yard - metre, acre - ?

HECTARE
List of words for the clue yard - metre, acre - ? from the crossword:
POUND GALLON METER FOOT LITRE TIME M KILOGRAM AREA POLO INCH CHURCHYARD ROO STERE ROOD EEYORE ROODS PROSODY MEASURE
WordClue
ACREmetre - yard, hectare - ?
INCHhectare - acre, centemetre - ?
MILEhectare - acre, kilometre - ?
YARDhectare - acre, metre - ?
LITREyard - metre, gallon - ?
METREacre - hectare, yard - ?
POUNDmetre - yard, kilogram - ?
GALLONmetre - yard, litre - ?
HUNDREDFranklin, yard
KILOGRAMyard - metre, pound - ?
KILOMETREacre - hectare, mile - ?
CENTEMETREacre - hectare, inch - ?
PULLyank, tug
LITREyard - metre, gallon - ?