tweeter vs loudspeaker

tweeter and loudspeaker both are nouns.

Word	Noun	Adjective	Verb	Adverb
tweeter	Yes	No	No	No
loudspeaker	Yes	No	No	No

As nouns, loudspeaker is a hypernym of tweeter; that is, loudspeaker is a word with a broader meaning than tweeter:

tweeter: a loudspeaker that reproduces higher audio frequency sounds
loudspeaker: electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance

Other hypernyms of tweeter include loudspeaker system, speaker, speaker system, speaker unit.

tweeter (noun)	loudspeaker (noun)
a loudspeaker that reproduces higher audio frequency sounds	electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance