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
未開拓【みかいたく】
undeveloped (area), unexplored (field of study), wild (areas), untapped area