Japanese edit

For pronunciation and definitions of こうあん – see the following entries.
公安
[noun] public safety
[noun] police officers responsible for matters of national security and counter-intelligence.
[proper noun] Tokyo Metropolitan Police Department Public Security Bureau
公案
[noun] koan
考案
[noun] device
[noun] plan, scheme
[verb] to design, to invent
[verb] to devise, to develop, to think up (a plan, method, etc.)
康安
[proper noun] the Kōan era, 1361-1362 by the Northern Court reckoning
弘安
[proper noun] the Kōan era, 1278-1288
高安
[proper noun] A county-level city in Yichun, Jiangxi, China.
(This term, こうあん, is the hiragana spelling of the above terms.)

(The following entries are uncreated: 香案, 苟安, 光安.)