複雑【ふくざつ】
complex, complicated, intricate, mixed (feelings)
複数【ふくすう】
plural, multiple, several
複合【ふくごう】
composite, combined, complex
重複【ちょうふく】
duplication, repetition, overlapping, redundancy, restoration
複写【ふくしゃ】
copying, duplication, reproduction, copy
複製【ふくせい】
reproduction, duplication, reprinting
複利【ふくり】
compound interest
複雑さ【ふくざつさ】
complexity
複写機【ふくしゃき】
photocopier, photocopying machine
複線【ふくせん】
double track, two-track line
複眼【ふくがん】
compound eye
複式【ふくしき】
double-entry (e.g. bookkeeping)
単複【たんぷく】
simplicity and complexity, singular and plural, single and double, singles and doubles (in tennis)