
1) Balaenoptera physalus 2) Common rorqual 3) Endangered whale 4) Fin whale 5) Finback whale 6) Razorback 7) Rorqual
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1) Whale
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https://www.crosswordclues.com/clue/finback

• (n.) Any whale of the genera Sibbaldius, Balaenoptera, and allied genera, of the family Balaenopteridae, characterized by a prominent fin on the back. The common finbacks of the New England coast are Sibbaldius tectirostris and S. tuberosus.
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http://thinkexist.com/dictionary/meaning/finback/

Fin'back` noun (Zoology) Any whale of the genera Sibbaldius , Balænoptera , and allied genera, of the family Balænopteridæ , characterized by a prominent fin on the back. The common finbacks of the New England coast are Sibbaldius tectirostris and S. tuberosus
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http://www.encyclo.co.uk/webster/F/30

The USS Finback was an American Gato Class submarine of 1525 tons displacement launched in 1941. The USS Finback had a top speed of 21 knots surfaced and carried a complement of between 65 and 74. She was armed with one 3 inch dual-purpose gun; two 20 mm Oerlikon anti-aircraft guns; six 21 inch bow torpedo tubes and four 21 inch stern torpedo tubes...
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[
n] - large flat-headed whalebone whale having deep furrows along the throat
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http://www.webdictionary.co.uk/definition.php?query=finback
finback whale noun large flat-headed whalebone whale having deep furrows along the throat; of Atlantic and Pacific
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https://www.encyclo.co.uk/local/20974

any baleen whale of the genus Balaenoptera, having a prominent dorsal fin, esp. B. physalus, of the Atlantic and Pacific coasts; rorqual: an endangered species.
Found on
https://www.infoplease.com/dictionary/finback
No exact match found.