"Barnlots" refer to a specific amount of land which can be used for building a barn or for agricultural activities. However, if you want to convey this same meaning in different words, there are several synonyms to choose from. Examples include "pastureland", "farmland", "meadow", "cultivated land", "agricultural land", and "cropland". Each of these synonyms implies that the land is used for farming or animal husbandry, like barnlots. If you are looking for a word that more specifically signifies barn-building potential, some synonyms include "barnyard", "stableyard", and "cow pen". These synonyms allude to the fact that the land may be used for animal housing and related activities.