barrier, restriction, obstruction, hindrance; see barrier,
impediment 1. See syn. study at impediment.
"obstacle." YourDictionary, n.d. Web. 14 January 2019. <https://thesaurus.yourdictionary.com/obstacle>.
obstacle. (n.d.). Retrieved January 14th, 2019, from https://thesaurus.yourdictionary.com/obstacle
Something that impedes or prevents entry or passage:
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