scold vs sound off

scold is a noun but sound off is not a noun.

Word	Noun	Adjective	Verb	Adverb
scold	Yes	No	Yes	No
sound off	No	No	Yes	No

As verbs, sound off is a hypernym of scold; that is, sound off is a word with a broader meaning than scold:

Other hypernyms of scold include complain, kick, kvetch, plain, quetch.

scold (noun)	sound off (noun)
someone (especially a woman) who annoys people by constantly finding fault

scold (verb)	sound off (verb)
censure severely or angrily	express complaints, discontent, displeasure, or unhappiness
show one's unhappiness or critical attitude	express one's opinion openly and without fear or hesitation
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