Easy adjective - Involving minimal difficulty or effort.
Natural is a synonym for easy in plain topic. In some cases you can use "Natural" instead an adjective "Easy", when it comes to topics like good-humored, relaxed, casual. popular alternative
Natural adjective - Being such from birth or by nature.
Easy is a synonym for natural in open topic. You can use "Easy" instead an adjective "Natural", if it concerns topics such as plain, unaffected, casual. popular alternative
Both words in one sentence
- The Tucks teach her how to live a very natural and easy lifestyle.
Source: Literature / Tuck Everlasting
- It could be that they have no natural fear of humans, and are relatively easy to work with.
- As JesuOtaku pointed out, making CG look natural and work well for the Humongous Mecha is not an easy task, but something that the animation team pulled off.
Source: Anime / Valvrave the Liberator
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Google Ngram Viewer shows how "easy" and "natural" have occurred on timeline