円貨 is read as えんか (enka) and means yen currency.
えんか
enka
えんかだて
yen-denominated (e.g. bond)
えんちゅう
round pillar (esp. in buildings)
えんしゅう
circumference
えんとう
cylinder
えんりょう
round collar (of traditional Japanese clothing)
えんいき
yen bloc
えんばんじょうぶんし
disc-like molecule
えんだかふきょう
recession caused by the strong yen
えんあつき
flatbed cylinder press
えんけいげきじょう
amphitheater
えんぶつきょう
Won Buddhism
まるやね
dome