physics is already in plural form.
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 the noun 'light' is lights.The noun 'light' is a count noun as a word for a thing that produces light such a an electrical device, a match or candle.The noun 'light' is an uncountable noun that has no plural form as a word for daylight or brightness.
The word nanosecond is a noun. The plural form is nanoseconds.
The plural form of the noun light is lights.The plural possessive form is lights'.
The plural form of the noun 'dynamo' is dynamos.
dynamoes
The plural form for the demonstrative pronoun this is these.
The plural form of the word "inferno" is "infernos."
The plural form of the word "ranch" is "ranches."
There is no plural form for the word, countries. This word itself is a plural.
There is no plural word for if.
The plural form is data.
The plural form for the word 'pioneer' is pioneers.
The plural form of the word "baby" is "babies."
The plural form of the word "pharynx" is "pharynges."
The plural form of vow is vows.