Fallow crop refers to a type of cultivated land left unplanted for a season or more in order to restore its fertility. There are several synonyms for the term, including "cover crop," which refers to a crop that is planted primarily to protect and enrich the soil, rather than for commercial harvest. Additionally, the term "green manure" refers to a crop that is grown specifically to be plowed under, adding organic matter to the soil. Other synonyms for fallow crop include "restorative crop," "respite crop," and "intermission crop" - all of which denote a temporary pause in cultivation designed to improve the health and productivity of the soil.