dynamos
The plural form of the word "physics" is still "physics" as it is already a plural noun.
Pulleys is the plural form; the singular is pulley.
There is no plural form of this noun. It is the name of a single, unique area of study (science). No plural form is necessary. Alternatively, "physics" is already the plural form of the word "physic", a now-archaic word meaning "medicine".
The plural form of "flashlight" is "flashlights."
The word 'Phenomenon' is singular. The plural form is 'Phenomena'.
The plural form of the noun 'dynamo' is dynamos.
The plural form for the demonstrative pronoun this is these.
dynamoes
The plural form of the word inferno is infernos.
The plural form is ranches.
There is no plural word for if.
There is no plural form for the word, countries. This word itself is a plural.
The plural form is data.
The plural form of the word "baby" is "babies."
The plural form for the word 'pioneer' is pioneers.
The plural form of the word "pharynx" is "pharynges."
The plural form of vow is vows.