barrier, restriction, obstruction, hindrance; see barrier,
impediment 1. See syn. study at impediment.
"obstacle." YourDictionary, n.d. Web. 11 October 2018. <http://thesaurus.yourdictionary.com/obstacle>.
obstacle. (n.d.). Retrieved October 11th, 2018, from http://thesaurus.yourdictionary.com/obstacle
Something that impedes or prevents entry or passage:
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