effect vs byproduct

effect and byproduct both are nouns.

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

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

effect (noun)	byproduct (noun)
an outward appearance	a product made during the manufacture of something else
(of a law) having legal validity	a secondary and sometimes unexpected consequence
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)	byproduct (verb)
produce
act so as to bring into existence