質問: Although the long あー sound occurs in many words written in katakana, and in some onomatopoeia and interjections (ザーザー, まあ, etc.) it seems to be very rare in words written with kanji. The only example that I know is お母さん{おかあさん}. Is this the only one, or are there other words written with kanji that use this sound? Clarification: I know there are many cases where two あ sounds meet across a morpheme boundary, e.g. 唐揚げ{からあげ}, which is not what I'm interested in. I'd like a list of kanji which have morpheme-internal readings containing あー.
回答: If your goal is kanji readings that contain a long あー sound, the quickest way to accomplish this is to use the advanced search on jisho.org (or a similar online dictionary). 拉麺【ラーメン】 will show up using the search query "*らー* #words", which in query terms means "any word that contains らー in any position". You can do the same thing with あー、わー、らー、やー、etc. which should yield you all the results for this you need. This will not, however, yield all results as some words like 婆さん will not show up. In order to return all possibilities, you need to include the second あ in your query.