The noun carpenter is a singular noun.
The plural form is carpenters.
Gallows is a plural noun. It has no singular form.
The noun radii is already a plural. The singular is radius.
The possessive form for the singular noun roof is roof's.The plural form for the noun roof is rooves.The plural possessive form is rooves'.
Yes, "windows" is a plural noun, referring to multiple window units. The singular form is "window." In different contexts, "Windows" can also refer to the Microsoft operating system, which is treated as a singular proper noun.
The singular form of the plural noun 'vertices' is vertex, a word for the highest point; the top or apex.
No. Carpenters is a plural noun, referring to more than one carpenter. The possessive singular noun form of carpenter is carpenter's, e.g. "The carpenter's saw needed to be sharpened." The possessive plural noun form of carpenter is carpenters', e.g. "All of those carpenters' tools are showing signs of rust."
The noun 'mice' is the plural form of the singular noun 'mouse'.
The singular noun is "louse" and the plural noun is "lice."
noun that are plural in form but singular in meaning
The noun children is the plural form of the singular noun child.
The noun 'circus' is a singular noun.The plural noun is 'circuses'.
The noun juggler is a singular noun. The plural noun is jugglers.
The singular noun is trio; the plural noun is trios.
The singular noun is Tuesday.The plural noun is Tuesdays.
The noun 'orchid' is a singular noun, a word for one.The plural noun is 'orchids'.
The noun mailbox is the singular form; the plural is mailboxes.
Statistics is plural, the singular form is statistic.