To classify a word, first establish its root radicals, then inspect their nature and positions. The contrasts become clear:
Word / formMeaning / explanation
ضَرَبَض ر ب: sound.
أَمَرَء م ر: hamzated-first.
وَعَدَو ع د: mithāl.
بَاعَب ي ع: ajwaf.
رَمَىر م ي: nāqiṣ.
وَفَىو ف ي: lafīf mafrūq.
طَوَىط و ي: lafīf maqrūn.
مَدَّم د د: doubled triliteral.
A single visible symbol is rarely sufficient. The radical inventory and each radical's position determine the meaningful diagnosis.