Simple, Gods.
None. It is the plural form of the Latin word piscis, a fish.
Forum---Plural Form Forums,Foreign Plural Form Forumina
Cubicula.
Linguae.
Dei is a form of the word "deus" meaning "a god" or "God". It's either the genitive singular ("of God/of a god") or the nominative/vocative plural ("gods" as a sentence subject).
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.
Actually, the plural form radiuses is accepted as correct and has found it's way into dictionaries (see the link below). The word radius and the plural radii are derived from the Latin word radius, a word for the spoke of a wheel. The plural form is a standard form for a plural in Latin.
culinae
Facimus.
The Latin "pelves" is the plural form of pelvis, although "pelvises" is also used in English.