speech balloon vs text

speech balloon and text both are nouns.

Word	Noun	Adjective	Verb	Adverb
speech balloon	Yes	No	No	No
text	Yes	No	Yes	No

As nouns, text is a hypernym of speech balloon; that is, text is a word with a broader meaning than speech balloon:

Other hypernyms of speech balloon include textual matter.

speech balloon (noun)	text (noun)
in cartooning, a rounded outline containing words.	the words of something written
	the main body of a written work (as distinct from illustrations or footnotes etc.)
	a book prepared for use in schools or colleges
	a passage from the Bible that is used as the subject of a sermon

speech balloon (verb)	text (verb)
	to send a message by SMS or similar text-based messaging service