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Base noun form. Used to categorize or group similar things, often in phrases like 『~の類』 (no rui, 'kind of ~') or as a suffix in compound words.
Theme

User and their classmate Sakura are organizing books in a library and discussing categorization methods.

るい

kind, class, family

Advanced ExpansionAbstract Concepts

Memory Hook

Imagine sorting things into a 'queue' (類 rui sounds like 'queue') based on their kind or class. 'Queue' them up by type — 類 (rui, 'kind, class, family').

Cultural Note

In Japanese, 『類』 (rui, 'kind, class, family') is often used in academic or formal contexts, such as in biology for classifying species into families or in everyday language to group similar items, like 『果物の類』 (kudamono no rui, 'fruits and the like').

Forms

Base: 類Base noun form. Used to categorize or group similar things, often in phrases like 『~の類』 (no rui, 'kind of ~') or as a suffix in compound words.