say vs speak

say is a noun but speak is not a noun.

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

say (noun)	speak (noun)
the chance to speak

say (verb)	speak (verb)
express in words	express in speech
report or maintain	exchange thoughts; talk with
speak, pronounce, or utter in a certain way	use language
express a supposition	give a speech to
give instructions to or direct somebody to do something with authority	make a characteristic or natural sound
communicate or express nonverbally
recite or repeat a fixed text
indicate
state as one's opinion or judgement; declare
utter aloud
have or contain a certain wording or form