Gentleman usher is two word. To make the plural of that term, you have to use the plural form of both words; so it would become gentlemen ushers.
The plural form of Gentleman is Gentlemen.
Ushers.
The word gentlemen is a noun. It is the plural form of gentleman.
Yes, gentlemen is a noun, the plural form of the noun gentleman, a common, abstract noun; a word for a chivalrous, courteous, or honorable man, a word for a person.
There is no plural form for the word, countries. This word itself is a plural.
The plural form for the demonstrative pronoun this is these.
The plural form of the word "inferno" is "infernos."
There is no plural word for if.
The plural form is data.
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.