Potential answers for "Structure with a keystone"

⭐⭐⭐⭐ ARCH
⭐⭐ INFRA
⭐⭐ HIVE
⭐⭐ TEPEE
⭐⭐ WIGWAM
⭐⭐ DAM
⭐⭐ CASTLE
⭐⭐ ARENA

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