根こん本ぽん

原げん因いんN4sense 1
原因 names the direct cause of an event, while 根本 points to the deeper underlying root that gave rise to it.
基き礎そN3sense 2
基礎 usually refers to a concrete or structural foundation, whereas 根本 is used for abstract, conceptual roots.
基き本ほんN3sense 2
基本 means the basics or standard starting point of something, while 根本 stresses the deepest, most essential root beneath it.
本ほん質しつN1sense 2
本質 refers to the essential nature or true character of a thing, while 根本 refers to its originating root or foundation.

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根ね元もとN1
根本 is abstract and formal, used for fundamental principles or the true root of a matter, while 根元 is concrete, referring to the actual physical base of a plant, hair, or object.
第だい一いち義ぎ
根本 refers to the root or foundation of something in a more concrete sense, while 第一義 emphasizes the most important meaning or principle involved.
根こん幹かん
根本 often points to the underlying cause or guiding principle of something, whereas 根幹 emphasizes the structural core or backbone that holds a system together.
根こん底ていN1
根本 refers to the root or origin of something and is used in everyday, concrete contexts like 根本的な問題, whereas 根底 is more formal and stresses the deepest, often hidden basis.
基もといN1
根本 stresses the deepest root cause of a matter, while 基 focuses on the basis on which something is built or established.

Don't confuse with

根こん源げん
根本 refers to the basis or foundation of a system, rule, or idea, while 根源 refers to the deep, original cause or source of something happening.

From Middle Chinese-derived kanji 根 (root) and 本 (origin, basis). The reading こんぽん is the standard Sino-Japanese on'yomi; こんぼん is an older variant.