What's the difference between these words? Apparently they both mean "morning" but are they interchangeable?
1 Answer
午{ご}前{ぜん} is used when specifying time in traditional 12-hours system (12時間制). (See also here.)
午{ご}前{ぜん}[8]{はち}時{じ} = 08:00 (in 24-hours system) = 08:00 [A.]{ante}[M.]{meridiem} (in 12-hours system)
午{ご}後{ご}[8]{はち}時{じ} = 20:00 (in 24-hours system) = 08:00 [P.]{post}[M.]{meridiem} (in 12-hours system)
Japan also has modern 24-hours system (24時制).
朝{あさ} is used for general meaning "the morning".
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I would like to add one thing. It is very true that '午前8時’ or '午後8時' is based on 12hr system, but, also in 24hr system, 0-12 is '午前' and 12-24 is '午後’. As you noticed, we don't say '午後15時' but '午後3時’, still '15時' is always '午後' and '3時(in 24hr system)' is '午前'.– MNEMOAug 8 at 2:08