countable noun
A grammatical term used in linguistics and language learning to refer to nouns that can be counted, such as 本 (book) or 犬 (dog).
In English, countable nouns require an article.
「本」は可算名詞で、「水」は不可算名詞です。
"Hon" (book) is a countable noun, while "mizu" (water) is an uncountable noun.