一円[ichien] one yen
一円玉[ichiendama] one-yen coin
一円札[ichiensatsu] one-yen bill
円か[madoka] round
円やか[maroyaka] round

円グラフ[engurafu] pie graph
円安[enyasu] cheap yen
円為替[engawase] yen exchange
円域[eniki] yen bloc

円墳[enpun] round burial mound
古墳[kofun] ancient (mound) tomb
前方後円墳[zenpoukouenfun] keyhole-shaped tumulus (form of ancient Imperial grave)
墳墓[funbo] grave
墳丘[funkyuu] tumulus

古墳時代[kofunjidai] Tumulus period (of Japanese history)
方墳[houfun] flat-topped burial mound
墳丘墓[funkyuubo] tomb embedded in a Yayoi period barrow
上円下方墳[jouenkahoufun] burial mound with square flat base and round top