The plural form for the noun torpedo is torpedoes.
The plural form of the noun river is rivers.
The correct plural form of the word "wife" is "wives."
The word "wolfs" is not correct. The correct spelling is wolves.
The plural of 'foot' is 'feet'.
Torpedoes
The answer to What is the plural form of the word gar is either gar or gars. (Both are correct.)
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.
"Classes" is the correct plural form of the word "class."
The word "women" in its plural form does not have an apostrophe before or after. The correct plural form is "women."
echoes
nimbuses