兌換[dakan] conversion (of paper money, esp. into specie)
兌換銀行[dakanginkou] bank of issue

兌換券[dakanken] convertible banknotes

アナログデジタル変換器[anarogudejitaruhenkanki] analog-digital converter
データ交換[deetakoukan] data exchange
パリティ変換[paritihenkan] parity transformation (physics)
メール交換[meerukoukan] exchange of letters
意見交換[ikenkoukan] exchange of ideas

引換て[hikikaete] on the contrary
下位互換性[kaigokansei] downward compatibility
かな漢字変換[kanakanjihenkan] kana-kanji conversion (on a computer, etc.)
可換群[kakangun] Abelian group
賀詞交換[gashikoukan] New Year greetings (parties)

行けない[ikenai] wrong
行る[yaru] to send
オリエント急行[orientokyuukou] Orient express
カ行[kagyou] classification for Japanese verb with the dictionary form ending in "ku"
ガ行[gagyou] classification for Japanese verb with the dictionary form ending in "gu"

サ行[sagyou] classification for Japanese verb with the dictionary form ending in "su"
ザ行[zagyou] classification for Japanese verb with the dictionary form ending in "zu"
スパイ行為[supaikoui] espionage
タ行[tagyou] classification for Japanese verb with the dictionary form ending in "tsu"
ダ行[dagyou] classification for Japanese verb with the dictionary form ending in "dzu"

為替銀行[kawaseginkou] exchange bank
一六銀行[ichirokuginkou] pawnshop
興業銀行[kougyouginkou] industrial bank
金銀[kingin] gold and silver
銀持[kanemochi] rich person

銀メダル[ginmedaru] silver medal
銀杏[ichou] ginkgo (Ginkgo biloba)
銀河[ginga] Milky Way
銀貨[ginka] silver coin
銀漢[ginkan] Milky Way