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class [classes]▼(social grouping, based on job, wealth, etc.)noun[UK: klɑːs] [US: ˈklæs]
food chain [food chains]▼(idiomatic: a hierarchy)noun[UK: fuːd tʃeɪn] [US: ˈfuːd ˈtʃeɪn]
hierarchy [hierarchy]▼(body of authoritative officials organised by rank)noun[UK: ˈhaɪə.rɑːk.i] [US: ˈhaɪə.ˌrɑːrk.i]
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