niche, slot, compartment; see hole 2, place 2.
classify, categorize, group, define; see classify.
"pigeonhole." YourDictionary, n.d. Web. 23 June 2018. <http://thesaurus.yourdictionary.com/pigeonhole>.
pigeonhole. (n.d.). Retrieved June 23rd, 2018, from http://thesaurus.yourdictionary.com/pigeonhole
To distribute into groups according to kinds:
To assign to a class or classes:
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