Common nouns are used to denote creatures, people, and races when no gender is specified. They are useful in their ability to be converted to Masculine-nouns using -û or -ô, or Feminine-nouns with -î or -ê.
Using a similar formation to, they usually use [a] as their last vowel, and cannot use [-î/-ê] or [-û/-ô] as an ending vowel. However, the last rule cannot
Characteristics
1. Similar to Neuter-nouns in formation.
2. Prefer neutral [a] as their last vowel.
3. Cannot use [-î/-ê] or [-û/-ô] as an ending vowel unless it is the base vowel (only possible with a biconsonantal root base).[1]
[1]. This actually applies to when the word is originally formed from its root. This means that so long as the original form of the word even as far back as primitive Adûnaic did not incorporate the gendered suffixes, it could “evolve” into using one of those long vowels naturally (e.g. manô, which is actually Common-gendered. It came from the late primitive Adûnaic word manau, which came from the early primitive word manaw).