barrier

"The high fence acts as a barrier to keep the neighborhood dogs from running into the street. "

"The language barrier made it difficult for the new student to understand her classmates. "

"The new school building's height is a barrier to the view from my apartment. "

"The preposition "to" acts as a barrier between the subject "she" and the verb "went," preventing a direct grammatical connection. "

"The blood-brain barrier prevents harmful toxins from entering the brain. "

"The barrier for the school science fair was based on the complexity of the projects. "

"The fencing instructor demonstrated several different barriers, showing the students the 15th-century martial techniques. "

"The new security system barred access to the building, barrierring unauthorized visitors. "