bark vs speak

bark is a noun but speak is not a noun.

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

As verbs, speak is a hypernym of bark; that is, speak is a word with a broader meaning than bark:

Other hypernyms of bark include mouth, talk, utter, verbalise, verbalize.

bark (noun)	speak (noun)
a sailing ship with 3 (or more) masts
the sound made by a dog
a noise resembling the bark of a dog
tough protective covering of the woody stems and roots of trees and other woody plants

bark (verb)	speak (verb)
tan (a skin) with bark tannins	express in speech
make barking sounds	exchange thoughts; talk with
speak in an unfriendly tone	use language
remove the bark of a tree	give a speech to
cover with bark	make a characteristic or natural sound