gulp vs speak

gulp is a noun but speak is not a noun.

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

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

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

gulp (noun)	speak (noun)
a large and hurried swallow
a spasmodic reflex of the throat made as if in swallowing

gulp (verb)	speak (verb)
utter or make a noise, as when swallowing too quickly	express in speech
to swallow hurriedly or greedily or in one draught	exchange thoughts; talk with
	use language
	give a speech to
	make a characteristic or natural sound