tannoy vs speaker

tannoy and speaker both are nouns.

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

As nouns, speaker is a hypernym of tannoy; that is, speaker is a word with a broader meaning than tannoy:

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

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

tannoy (noun)	speaker (noun)
a loudspeaker	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)