Beyond and Behind

Beyond adverb - Farther along in space or time or degree.

Behind is a synonym for beyond in since topic. In some cases you can use "Behind" instead the word "Beyond" as a preposition or an adverb, when it comes to topics like further, by, to, for.

Behind adverb - In or to or toward the rear.

Beyond is a synonym for behind in since topic. You can use "Beyond" instead the word "Behind" as a preposition or an adverb, if it concerns topics such as by, to, for, at the back of.