This is the 5437th most frequent Japanese word.
あさっ
"あさっ" is not a standard Japanese word; it might be a typo or colloquialism.
The word '朝' (あさ) here refers to 'morning', showing its common usage as a noun to indicate the time of day.
今日の朝は早起きしました。
This morning, I woke up early.
In this sentence, '朝ごはん' combines '朝' (morning) and 'ごはん' (meal/rice) to mean 'breakfast', illustrating a compound formation for expressing meals associated with morning.
朝ごはんを食べませんでした。
I did not eat breakfast.
'毎朝' combines '毎' (every) and '朝' (morning), indicating recurring activity or habit during mornings.