Semitic rootThe roots of verbs and most nouns in the Semitic languages are characterized as a sequence of consonants or "radicals" (hence the term consonantal root). Such abstract consonantal roots are used in the formation of actual words by adding the vowels and non-root consonants (or "transfixes") which go with a particular morphological category around the root consonants, in an appropriate way, generally following specific patterns.
ApophonyIn linguistics, apophony (also known as ablaut, (vowel) gradation, (vowel) mutation, alternation, internal modification, stem modification, stem alternation, replacive morphology, stem mutation, internal inflection etc.) is any alternation within a word that indicates grammatical information (often inflectional). Apophony is exemplified in English as the internal vowel alternations that produce such related words as sng, sng, sng, sng bnd, bnd bld, bld brd, brd dm, dm fd, fd l, l rse, rse, rsen wve, wve ft, ft gse, gse tth, tth The difference in these vowels marks variously a difference in tense or aspect (e.