開拓【かいたく】
reclamation (e.g. of wasteland), cultivation, development, pioneering, opening up (e.g. of a new market), breaking new ground, trailblazing
拓殖【たくしょく】
colonization, colonisation, development, settlement, exploitation
干拓【かんたく】
land reclamation (from sea)
開拓者【かいたくしゃ】
pioneer, settler, colonist
拓本【たくほん】
rubbed copy, folio of rubbings