ěr ear

Forms

• 耳 left — As a left-side component the bottom horizontal becomes a rising stroke (提).
• 耳 bottom — 作下部件时横向舒展，末笔提改为横，托住上方部件。

Characters that use it as a component

取敢耸耻耽耿聂聆

Characters filed under it as a radical

Kangxi radical no.128 · 6strokes — The 214 Kangxi radicals

Filed under it in a dictionary. That is a lookup convention — it does not mean it is the only part the character is built from.

耳耸耻耽耿聂聆聊