The plural is footsteps.
The word footsteps is a plural noun. The singular is footstep.
Yes, the compound word 'footsteps' is a noun, the plural form of the noun 'footstep'; a word for the setting down of a foot, or the sound so produced by the setting down of a foot; a word for a thing.
Bridges is the plural form of bridge.
"Groceries" is the plural form of "grocery."
There is no plural form for the word, countries. This word itself is a plural.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
The plural form of "meter" is "meters."
It has no plural form.
The plural form for the noun sergeant is sergeants; the plural possessive form is sergeants'.
The plural form of rung is rungs.
The plural form of mouth is mouths. The plural form of month is months. The Mounth is a range of hills in Scotland and does not have a plural form.