badminton vs doubles

badminton and doubles both are nouns.

Word	Noun	Adjective	Verb	Adverb
badminton	Yes	No	No	No
doubles	Yes	No	No	No

As nouns, doubles is a hyponym of badminton; that is, doubles is a word with a more specific, narrower meaning than badminton:

badminton: a game played on a court with light long-handled rackets used to volley a shuttlecock over a net
doubles: badminton played with two players on each side

Other hyponyms of badminton include battledore, battledore and shuttlecock, singles.

badminton (noun)	doubles (noun)
a game played on a court with light long-handled rackets used to volley a shuttlecock over a net	tennis played with two players on each side
	badminton played with two players on each side