The plural ending is "ices". This can be seen where the plural of suffix is suffices.
Prongs is the plural of prong
As with most words ending with 'y', the plural is made by dropping the 'y' and adding 'ies' — so 'melodies' is the plural.
The plural possessive is others'. You simply add an apostrophe to a plural ending in 's' to make it possessive.
A plural noun is a word for more than one person, place, or thing. Here are some rules to make singular nouns into plural nouns:To make most nouns plural, add an s to the end of the word. The plural of flower is flowers.Nouns ending in s, z, ch, sh, or x, add es to the end of the word to make it plural. The plural of dish is dishes.Some nouns ending with o are pluralized by adding and es to the end of the word. The plural of tomato is tomatoes.Most nouns ending with o are pluralized by adding s to the end of the word. The plural of photo is photos.When a noun ends in a y, change the y at the end of the word to an ies. The plural of berry is berries.Some nouns ending with y, preceded by a vowel, are pluralized by just adding s to the end of the word. The plural of dayis days.Nouns ending with f or fe, change to f or the fe to ves to form the plural. The plural of life is lives.Nouns ending with ff are usually pluralized by just adding an s to the end of the word. The plural of cuff is cuffs.Some nouns change the vowel sound to become plural. The plural of man is men, the plural of tooth is teeth.Some Old English plurals are still in use. The plural of child is children, the plural of ox is oxen.Some nouns that end with is, the ending is changed to es to form the plural. The plural of crisis is crises.Some nouns that end with um, the um is replaced with an a. The plural for datum is data, the plural for medium is media.Some nouns that end with on, the on is replaced with an a. The plural of phenomenon is phenomena.Some nouns that end is a, change the a at the end of the word to ae. The plural of larva is larvae.Some nouns that end in ex or ix, the plural is formed by changing the x to ces. The plural of index is indeces, the plural of matrix is matrices.Some nouns that end in us, the plural is formed by changing the us to i. The plural of cactus is cacti, the plural of radius is radii.Nouns ending in eau, the plural is formed by adding x to the end of the word. The plural of bureau is bureaux.There are any number of other variations such as the plural of tempo is tempi; the plural of cherub is cherubim; the plural of person is people. But language evolves over time or we would still be speaking like Shakespeare. Even as I type these rules, some are officially amended. For example, the plural forms indeces and indexes are both being accepted as correct plurals for index and the plural forms bureaux and bureaus are both being accepted as correct plurals for bureau, as are many other irregular plurals being found in standard dictionaries with modernized plural options.
For an English plural, the answer is never. Some words ending in the letter 's' are made plural by adding 'es', such as one bus, two buses or one class, two classes.
A quantity of nine (9)
Genus has the plural genera.
prefix
Prongs is the plural of prong
Some nouns ending in -is are made plural by changing the ending to -es; examples:axis - axesbasis - basescrisis - crisesdiagnosis - diagnosesellipsis - ellipsesSome nouns ending in -is are regular plurals adding the ending -es to the end of the word; examples:iris - irisesmantis - mantisesmetropolis - metropolisespelvis - pelvisestrellis - trellises
It really depends. If this is purely English, then it may just use the English 's' plural ending. If, however, it is Latin-derived, it is then most likely going to end in -ae (which is the Latin first-declension plural ending).
No, nouns ending in 's' are not always plural; some examples are:abacusabyssaddressasparagusbassbiasbonusbuscactuscallouscampuscircusclasscompasscosmosdaisdiabetesdiscusdressemphasisethosficusfocusfungusgasgeniusglassgrasshaggishepatitishiatushibiscushippopotamushummusibisisthmuskisslasslenslossmantismessmetropolismolassesmossnemesisnexusnucleusoasisoctopusonusosmosispantsparenthesispasspelvisphysicsplatypuspluspressprogresspusradiusrhesusruckussassafrassisstatusstratusstresssuccesssurplussynopsistennisTexastrellistrussviruswalruswatercresswellnesswitnessyes
Some plural words ending in "o" are photos, pianos, casinos, and zoos.
Some plural nouns that end with 'os' are:avocadosbanjosbarriosbongosechosegosflamingosghettosgigoloshaloshobosJellokangaroolassologosnachospatiosphotospianospiccolosradiosrhinossolosstudiostacostattoostriosvideoszeroszoos
The second declension vocative ending for the masculine singular is '-e'. For the masculine plural and neuter singular and plural, the vocative ending is the same as the nominative ending.
The possessive form of the plural noun cars is cars'.The possessive of all plural English nouns ending in -s is formed by adding an apostrophe after the ending -s.
Some examples of plural nouns not ending with 's' are children, men, women, mice, and geese.