Aristocrat is the safest claim if you don’t have more specific information, because in modern parlance it basically just refers to a rich person who gets money independent of working or at a wildly inflated rate relative to their labor. Nobility refers to a sort of caste with hereditary titles to land, etc. Kulaks are basically rich-ish peasants, who own enough to mainly have other peasants work their land, and these kulaks were becoming petite-bourgeois (the nearest equivalent of kulaks in capitalism) as Russia started to modernize.
Aristocrat is the safest claim if you don’t have more specific information, because in modern parlance it basically just refers to a rich person who gets money independent of working or at a wildly inflated rate relative to their labor. Nobility refers to a sort of caste with hereditary titles to land, etc. Kulaks are basically rich-ish peasants, who own enough to mainly have other peasants work their land, and these kulaks were becoming petite-bourgeois (the nearest equivalent of kulaks in capitalism) as Russia started to modernize.