etymology - Exceptional compounding forms

There are a number of Japanese words which have distinct compounding forms:

• -a/-e alternation: 天・雨、酒、上、風、目 — many examples.


• -u/-i alternation: 神（[神]{かむ}[集]{つど}ふ）、月（[月]{つく}[読]{よみ}）


• -o/-i alternation: 木（[木]{こ}の[葉]{は}）、火（炎【ほのほ】）


• -a/-o alternation: 白（[白]{しら}[雪]{ゆき}）

This BBS post has more examples. There is also another kind of alternation I know of, even rarer:

• s-insertion: 雨（[春]{はる}[雨]{さめ}）、青（[真]{ま}っ[青]{さを})

I have three questions:

1. Are there any other alternations I have missed?


2. Is there an exhaustive listing of words with exceptional compound forms somewhere?


3. To what extent is this process still alive? For instance, [風]{かざ}[車]{ぐるま} is a comparatively recent coinage.