Behind and Back of

Behind preposition - At, to, or toward the rear of.

Back of is a synonym for behind in following topic. In some cases you can use "Back of" instead the word "Behind" as an adverb or an adjective or a preposition.

Back of preposition - At, to, or toward the rear of.

Behind is a synonym for back of in end topic. You can use "Behind" instead the phrase "Back of" as a preposition or an adjective or an adverb, if it concerns topics such as back, following in position or time.