12
cruiser(noun, vessel, boat, ship, combatant)
11
battleship(noun, vessel, boat, ship, combatant)
10
carrier(noun, vessel, boat, ship, combatant)
10
corvette(noun, vessel, boat, ship, combatant)
10
frigate(noun, vessel, boat, ship, combatant)
10
torpedo-boat(noun, vessel, boat, ship, combatant)
9
firm(adjective, set, hard, usual, regular)
9
warship(noun, vessel, boat, ship, transportation)
8
admiral(noun, vessel, boat, ship, transportation)
8
boat(noun, vessel, ship, transportation)
8
inflexible(adjective, set, hard, severe, harsh)
8
rigid(adjective, set, hard, severe, cruel)
8
ship(noun, vessel, boat, transportation)
8
yacht(noun, vessel, boat, ship, transportation)
7
armored cruiser(expression, idiom, vessel, boat, ship)
7
brassbound(adjective, character, behavior, pedant)
7
guard ship(expression, idiom, vessel, boat, ship)
7
protected cruiser(expression, idiom, vessel, boat, ship)
7
unalterable(adjective, set, hard, fixed, stiff)
6
capital ship(vessel, boat, ship, transportation)
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APASmart Define. (2015). ironclad thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/ironclad/thesaurus/synonyms
ChicagoSmart Define. 2015. "ironclad thesaurus" https://smartdefine.org/ironclad/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, ironclad thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/ironclad/thesaurus/synonyms>.
MLASmart Define. "ironclad thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/ironclad/thesaurus/synonyms>