metre - yard, litre - ?

GALLON
List of words for the clue metre - yard, litre - ? from the crossword:
METER ACRE PETROL FOOT POUND KILOGRAM STERE RETAIL MILE MAGNUM LITER L KILOMETRE INCH CENTEMETRE TIME PROSODY MEASURE M
WordClue
ACREmetre - yard, hectare - ?
INCHlitre - gallon, centemetre - ?
MASSmeter - distance, kilogram - ?
MILElitre - gallon, kilometre - ?
TIMEmeter - distance, second - ?
UNITcarat or gallon
YARDlitre - gallon, metre - ?
LITREyard - metre, gallon - ?
METREgallon - litre, yard - ?
POUNDmetre - yard, kilogram - ?
SECONDdistance - meter, time - ?
HECTAREyard - metre, acre - ?
HUNDREDFranklin, yard
DISTANCEsecond - time, meter - ?
KILOGRAMyard - metre, pound - ?
KILOMETREgallon - litre, mile - ?
CENTEMETREgallon - litre, inch - ?
POUNDmetre - yard, kilogram - ?
SUBWAYmetro