speak vs harangue

speak is not a noun while harangue is a noun.

Word	Noun	Adjective	Verb	Adverb
speak	No	No	Yes	No
harangue	Yes	No	Yes	No

As verbs, harangue is a hyponym of speak; that is, harangue is a word with a more specific, narrower meaning than speak:

Other hyponyms of speak include blaze away, memorialise, memorialize, keynote.

speak (noun)	harangue (noun)
	a loud bombastic declamation expressed with strong emotion

speak (verb)	harangue (verb)
express in speech	deliver a harangue to; address forcefully
exchange thoughts; talk with
use language
give a speech to
make a characteristic or natural sound