position effect vs event

position effect and event both are nouns.

Word	Noun	Adjective	Verb	Adverb
position effect	Yes	No	No	No
event	Yes	No	No	No

As nouns, event is a hypernym of position effect; that is, event is a word with a broader meaning than position effect:

position effect: (genetics) the effect on the expression of a gene that is produced by changing its location in a chromosome
event: a phenomenon that follows and is caused by some previous phenomenon

Other hypernyms of position effect include consequence, effect, issue, outcome, result, upshot.

position effect (noun)	event (noun)
(genetics) the effect on the expression of a gene that is produced by changing its location in a chromosome	something that happens at a given place and time
	a phenomenon located at a single point in space-time; the fundamental observational entity in relativity theory
	a phenomenon that follows and is caused by some previous phenomenon
	a special set of circumstances