affectation vs pretending

affectation and pretending both are nouns.

Word	Noun	Adjective	Verb	Adverb
affectation	Yes	No	No	No
pretending	Yes	No	No	No

As nouns, pretending is a hypernym of affectation; that is, pretending is a word with a broader meaning than affectation:

Other hypernyms of affectation include feigning, pretence, pretense, simulation.

affectation (noun)	pretending (noun)
a deliberate pretense or exaggerated display	the act of giving a false appearance