reward vs decorate

reward is a noun but decorate is not a noun.

Word	Noun	Adjective	Verb	Adverb
reward	Yes	No	Yes	No
decorate	No	No	Yes	No

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

Other hyponyms of reward include drink, pledge, salute, toast, wassail, dignify, ennoble.

reward (noun)	decorate (noun)
an act performed to strengthen approved behavior
benefit resulting from some event or action
the offer of money for helping to find a criminal or for returning lost property
a recompense for worthy acts or retribution for wrongdoing
payment made in return for a service rendered

reward (verb)	decorate (verb)
strengthen and support with rewards	provide with decoration
act or give recompense in recognition of someone's behavior or actions	make more attractive by adding ornament, colour, etc.
bestow honor or rewards upon	award a mark of honor, such as a medal, to
	be beautiful to look at