Vortexes and Vortices
Vortex already is a singular form. The plural can be vortexes or vortices. Both are equally correct.
vortices
A vortex is form when the whirling motion of the cloud vortex results from a rapid downdraft of cold air replacing rising hot air.
yes
A whirlpool is a kind of vortex. More specifically, a whirlpool is a vortex in water that can form from interacting currents. Different types of vortex can occur in air, water, or just about any liquid or gas.
Bridges is the plural form of bridge.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
There is no plural form for the word, countries. This word itself is a plural.
"Groceries" is the plural form of "grocery."
The plural form of "meter" is "meters."
The plural form of the demonstrative pronoun 'that' is those.
The plural form for the noun sergeant is sergeants; the plural possessive form is sergeants'.