ordain vs doom

ordain is not a noun while doom is a noun.

Word	Noun	Adjective	Verb	Adverb
ordain	No	No	Yes	No
doom	Yes	No	Yes	No

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

Other hyponyms of ordain include predestine, will, designate, destine, fate.

ordain (noun)	doom (noun)
	an unpleasant or disastrous destiny

ordain (verb)	doom (verb)
issue an order	pronounce a sentence on (somebody) in a court of law
appoint to a clerical posts	decree or designate beforehand
order by virtue of superior authority; decree	make certain of the failure or destruction of
invest with ministerial or priestly authority