blurt vs speak

blurt and speak both are verbs.

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

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

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

blurt (verb)	speak (verb)
utter impulsively	express in speech
	exchange thoughts; talk with
	use language
	give a speech to
	make a characteristic or natural sound