growler vs verbalizer

growler and verbalizer both are nouns.

Word	Noun	Adjective	Verb	Adverb
growler	Yes	No	No	No
verbalizer	Yes	No	No	No

As nouns, verbalizer is a hypernym of growler; that is, verbalizer is a word with a broader meaning than growler:

growler: a speaker whose voice sounds like a growl
verbalizer: someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

Other hypernyms of growler include speaker, talker, utterer, verbaliser.

growler (noun)	verbalizer (noun)
a small iceberg or ice floe just large enough to be hazardous for shipping	someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)
a speaker whose voice sounds like a growl