speaker vs loudspeaker

speaker and loudspeaker both are nouns.

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

As nouns, speaker and loudspeaker are synonyms defined as:

speaker and loudspeaker: electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance

Other synonyms of speaker include loudspeaker system, speaker system, speaker unit.

speaker (noun)	loudspeaker (noun)
electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance	electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance
someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)