When to use がつ or げつ and ごく or こく

[zEUs_Japanese]

@alo

On WK, only 天国 and 中国 use the ごく reading.

And there is also 隣国 (りんごく) - the Neighboring Country. But those are the only three countrys in the WK database that rendaku. If you struggle with other cases, where you don’t exactly know why something redaku’d or didn’t rendaku, the [Userscript] WaniKani Rendaku Information might be helpful.