maelstrom /mālˈstrom/

1. A particularly powerful whirlpool
2. (with cap) a well-known whirlpool off the coast of Norway
3. A confused or disordered state of affairs
4. Any resistless overpowering influence for destruction

• ostensibly
• ostensive
• ostensively
• ostensiveness
• ostensories
• ostensory
• ostent
• ostentation
• ostentations
• ostentatious
• ostentatiously
• ostentatiousness
• ostents
• osteo-
• osteoarthritic
• osteoarthritis
• osteoarthroses
• osteoarthrosis
• osteoblast
• osteoblastic
• osteoblasts
• osteochondritis
• osteochondroses
• osteochondrosis
• osteoclases