The plural of cone is cones.
The plural of the word shield is shields.
The plural of may is the same word (still may)
The plural for for the noun glass is glasses.
Greatest is an adjective. It has no plural because it is not a noun.
rhombuses
The plural of cone is cones.
If you mean the cone shaped hat with tassels, then the plural word is fezzes.
The word crises is a plural word; it is the plural form of the word crisis.
There is 1 syllable in cone.
snow cone
The cone is the apex of the volcano.
There is no plural word for if.
The plural word for delay is delays.
Cone flower = pua ekineikea
The plural form for the demonstrative pronoun this is these.
A non-plural word, a word (noun or pronoun) that is not plural is singular, a word for just one.
The driver crushed the orange road cone. I wanted an ice cream cone.