The word singular is an adjective. It means to be the only one or unique.
Singular can be used as an adjective or a noun.
The word minion is a singular noun. The plural form is minions.
The word cossacks is a plural noun. The singular is cossack.
The word nation is a singular noun. The plural would be nations.
The word boiler is a singular noun. The plural is boilers.
The word mutiny is a singular noun. The plural form is mutinies.
"Mar" can be a noun, a verb, or a proper noun. It depends on the context in which it is used.
What is has's part of speech? means What is the part of speech of 'has'?The answer is that it is a verb: 'has' is the third person singular present tense of the verb 'to have'.
Noun, Plural or singular
Noun singular Noun plural Verb (third person singular)
AstroTurfs is a plural noun. The singular is AstroTurf.
The word tabs is a plural noun. The singular is tab.
Helicopters is a plural noun. The singular form is helicopter.
The word "hordes" is a noun. It refers to a large group or crowd of people.
The word crises is a plural noun. The singular is crisis.
The word authorship is a singular noun. The plural is authorships.
The word nerves is a plural noun. The singular is nerve.
The word fans is a plural noun. The singular is fan.