完結[kanketsu] conclusion
完結文[kanketsubun] sentence
完済[kansai] full payment
完熟[kanjuku] completely ripe or mature
完遂[kansui] to accomplish

完成[kansei] complete
完成品[kanseihin] finished product
完全[kanzen] perfection
完全コピー[kanzenkopii] exact copy
完全主義者[kanzenshugisha] perfectionist

御馳走様でした[gochisousamadeshita] That was a delicious meal (said after meals)
一っ走り[hitoppashiri] spin (as in 'take a car for a spin')
一走り[hitohashiri] spin
逸走[issou] escape
駅伝競走[ekidenkyousou] long-distance relay race

快走[kaisou] fast sailing (running)
滑走[kassou] glide
滑走路[kassouro] runway
完走[kansou] running the race
競走[kyousou] race