Degrees of Transparency in Word Formation

New words can be formed by adding suffixes to other words. Derived words formed in this way may be phonologically transparent with respect to their base word, or they may be opaque; monstrous is preserved in monstrous#ness but not in monstro+sity . The juncture between suffix and stem is either a word boundary (#) or a formative boundary (+), and while word boundary derivations are always transparent, formative boundary derivations usually result in stress shifting to a syllable other than the syllable which is stressed in the base word, vowel quality changing, etc.