The word singular is an adjective. It means to be the only one or unique.
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.
"Mar" can be a noun, a verb, or a proper noun. It depends on the context in which it is used.
The word boiler is a singular noun. The plural is boilers.
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)
The word minion is a singular noun. The plural form is minions.
AstroTurfs is a plural noun. The singular is AstroTurf.
The word lots is a plural noun. The singular is lot.
The word vices is a plural noun. The singular is vice.
The word instructions is a plural noun. The singular is instruction.
The word presidios is a plural noun. The singular is presidio.
The word buoys is a plural noun. The singular is buoy.
The word cohorts is a plural noun. The singular is cohort.
Owners is a plural noun. The singular is owner.