丸

also 円

1. noun circle
2. noun, prefix entirety; whole; full; complete
3. noun, slang money; dough; moola
4. esp. 丸 enclosure inside a castle's walls
5. Kansai-ben soft-shelled turtle
6. suffix, esp. 丸 suffix for ship names; suffix for names of people (esp. infants); suffix for names of swords, armour, musical instruments, etc.; suffix for names of dogs, horses, etc.

がん

1. noun, suffix fishball; meatball
2. pill