Sinonim are

English Thesaurus

1. a unit of surface area equal to 100 square meters (noun.quantity)

hypernym	:	area unit, square measure,
definition	:	a system of units used to measure areas (noun.quantity)

part meronym	:	hectare,
definition	:	(abbreviated `ha') a unit of surface area equal to 100 ares (or 10,000 square meters) (noun.quantity)