Both are used to describe things, but “feature” is used in a commercial context, where you’re highlighting a positive so that someone sees value/wants to buy. For example: Another great feature of this house is the fireplace.
They are very similar, but characteristic is often used to talk about people or living things, someone's personality is one of their characteristics. Feature is often used to describe something visual about a non-living thing, or something that the thing has. for example, a car's color is a feature, a phone's battery capacity is a feature, and a mountain's cliff is one of it's features. Also, you could say that 富士山 is one of Japan's features. You can also say that someone's eyes are one of their features though, so it works for living things too.
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