at least for the second, I'd say: dis-illusion-ment. and un/bear/able/ity sounds fine to me. Maybe you'd need an ethymological dictionnary?
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a 'tree' for "disillusionment" only should consist of disillusion + -ment?
c.1340, "act of deception," from O.Fr. illusion "a mocking," from L. illusionem (nom. illusio) "a mocking, jesting, irony," from illudere "mock at," lit. "to play with," from in- "at" + ludere "to play." Sense of "deceptive appearance" developed in Eng. c.1374. Illusionist "conjurer, magic act performer" is from 1850. Illusive formed in Eng. 1679; th