複 （フク） compound, composite, multiple, re-, bi-, doubles (tennis, badminton, etc.), place bet (in horse racing, etc.), show bet, bet that predicts a top 2 or top 3 finish (depending on number of horses, etc. in race)

複合 （フクゴウ） composite, combined, complex

重複 （チョウフク） duplication, repetition, overlapping, redundancy, restoration

遺伝子重複 （イデンシジュウフク） gene duplication