speaker vs speak

speaker is a noun but speak is not a noun.

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

speaker (noun)	speak (noun)
electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance
someone who expresses in language; someone who talks (especially someone who delivers a public speech or someone especially garrulous)

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