WordNet: U-boat, pigboat, sub, submarine

a submersible warship usually armed with torpedoes

• hypernym submersible, submersible warship

• hyponym attack submarine

• hyponym auxiliary research submarine

• hyponym fleet ballistic missile submarine

• hyponym nautilus, nuclear-powered submarine, nuclear submarine

U-boat

• (suomi) sukellusvene (synonyymi)

• (suomi) u-vene (yläkäsite)

pigboat

• (suomi) sukellusvene (synonyymi)

sub

• (suomi) sukellusvene (synonyymi)

submarine

• (englanti) submarine (derivationally related)
• (suomi) sukellusvene (synonyymi)