Both the singular and plural form of this word is "processus", it does not differ.
les is the plural for both articles 'la' and 'le' in French
Not exactly, but French comes from Latin.
Cubicula.
Linguae.
you ( plural or polite form)
The Latin masculine noun draco (a snake) has the nominative plural form dracones
Gladioli (actual Latin plural) or gladioluses (Anglicized).
The plural of vertebra is vertebrae.
culinae
Facimus.
Simple, Gods.
"Nieces" is the plural form of "niece" in English. In French, "niece" is translated as "nièce" in singular and "nièces" in plural.