dismiss vs say farewell

dismiss and say farewell both are verbs.

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

As verbs, say farewell is a hypernym of dismiss; that is, say farewell is a word with a broader meaning than dismiss:

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

dismiss (verb)	say farewell (verb)
declare void	say good-bye or bid farewell
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