tourney vs World Cup

tourney and World Cup both are nouns.

Word	Noun	Adjective	Verb	Adverb
tourney	Yes	No	Yes	No
World Cup	Yes	No	No	No

As nouns, World Cup is a hyponym of tourney; that is, World Cup is a word with a more specific, narrower meaning than tourney:

tourney: a sporting competition in which contestants play a series of games to decide the winner
World Cup: a soccer tournament held every four years between national soccer teams to determine a world champion

Other hyponyms of tourney include elimination tournament, open, round robin.

tourney (noun)	World Cup (noun)
a sporting competition in which contestants play a series of games to decide the winner	a soccer tournament held every four years between national soccer teams to determine a world champion

tourney (verb)	World Cup (verb)
engage in a tourney