say farewell vs dismiss

say farewell and dismiss both are verbs.

Word	Noun	Adjective	Verb	Adverb
say farewell	No	No	Yes	No
dismiss	No	No	Yes	No

As verbs, dismiss is a hyponym of say farewell; that is, dismiss is a word with a more specific, narrower meaning than say farewell:

say farewell: say good-bye or bid farewell
dismiss: end one's encounter with somebody by causing or permitting the person to leave

Other hyponyms of say farewell include usher out.

say farewell (verb)	dismiss (verb)
say good-bye or bid farewell	declare void
	bar from attention or consideration
	end one's encounter with somebody by causing or permitting the person to leave
	cease to consider; put out of judicial consideration
	terminate the employment of; discharge from an office or position
	stop associating with