bespeak vs excuse

bespeak is not a noun while excuse is a noun.

Word	Noun	Adjective	Verb	Adverb
bespeak	No	No	Yes	No
excuse	Yes	No	Yes	No

As verbs, excuse is a hyponym of bespeak; that is, excuse is a word with a more specific, narrower meaning than bespeak:

bespeak (noun)	excuse (noun)
	a poor example
	a defense of some offensive behavior or some failure to keep a promise etc.
	a note explaining an absence

bespeak (verb)	excuse (verb)
express the need or desire for	accept an excuse for
be a signal for or a symptom of	defend, explain, clear away, or make excuses for by reasoning
	excuse, overlook, or make allowances for; be lenient with
	serve as a reason or cause or justification of
	grant exemption or release to
	ask for permission to be released from an engagement