squawker vs speaker unit

squawker and speaker unit both are nouns.

Word	Noun	Adjective	Verb	Adverb
squawker	Yes	No	No	No
speaker unit	Yes	No	No	No

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

squawker: the loudspeaker on an intercom or public address system
speaker unit: electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance

Other hypernyms of squawker include loudspeaker, loudspeaker system, speaker, speaker system.

squawker (noun)	speaker unit (noun)
the loudspeaker on an intercom or public address system	electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance
a person given to excessive complaints and crying and whining