butterfly vs speak

butterfly is a noun but speak is not a noun.

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

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

Other hypernyms of butterfly include talk.

butterfly (noun)	speak (noun)
a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down
diurnal insect typically having a slender body with knobbed antennae and broad colorful wings

butterfly (verb)	speak (verb)
talk or behave amorously, without serious intentions	express in speech
cut and spread open, as in preparation for cooking	exchange thoughts; talk with
flutter like a butterfly	use language
	give a speech to
	make a characteristic or natural sound