time - second, mass - ?

KILOGRAM
List of words for the clue time - second, mass - ? from the crossword:
ASIA UNIT AOL ISLE USA ITALY NEW METER DISTANCE SLUG AMEN EDT EST IRAE EVE UPON RERUN AVE ONCE
WordClue
WADamorphous, compact mass
BULKmass, heap
CLOTthrombus, solidified mass of blood
FUZZfrizzy mass of hair or fibre
HEAPpile, mass
HOSTlegion, mass
LOADlot, mass
LOAFusually oblong mass of food
MASSsecond - time, kilogram - ?
PILEmass, agglomeration
PULPsoft, moist mass
RAINdrop (small mass of liquid) ✕1000000
TIMEkilogram - mass, second - ?
CROWDgroup, mass
GROUPcrowd, mass
HORDEbattalion, mass
METERtime - second, distance - ?
OUNCEunit of mass
SECONDmass - kilogram, time - ?
DISTANCEsecond - time, meter - ?
METERtime - second, distance - ?
TERMtime, span