pirate vs sea king

pirate and sea king both are nouns.

Word	Noun	Adjective	Verb	Adverb
pirate	Yes	No	Yes	No
sea king	Yes	No	No	No

As nouns, sea king is a hyponym of pirate; that is, sea king is a word with a more specific, narrower meaning than pirate:

pirate: someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation
sea king: a Viking pirate chief

Other hyponyms of pirate include Barbary pirate, corsair.

pirate (noun)	sea king (noun)
a ship that is manned by pirates	a Viking pirate chief
someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation
someone who uses another person's words or ideas as if they were his own

pirate (verb)	sea king (verb)
take arbitrarily or by force
copy illegally; of published material