effect vs backdate

effect is a noun but backdate is not a noun.

Word	Noun	Adjective	Verb	Adverb
effect	Yes	No	Yes	No
backdate	No	No	Yes	No

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

Other hyponyms of effect include bring to bear, carry.

effect (noun)	backdate (noun)
an outward appearance
(of a law) having legal validity
an impression (especially one that is artificial or contrived)
the central meaning or theme of a speech or literary work
a phenomenon that follows and is caused by some previous phenomenon
a symptom caused by an illness or a drug

effect (verb)	backdate (verb)
produce	make effective from an earlier date
act so as to bring into existence