Here are a few examples of irregular plural nouns:
The plural form of "axe" is "axes."
It's spelled cacti. The plural form of cactus is like the plurals for octopus and pegasus (e.g. octopi and pegasi). These particular words are spelled in exactly the same way as their Latin root words would be, so the us is changed to i.
The plural of cyclops is cyclops.The plural form of cyclops is cyclopsor cyclopes.
Its plural can be spelled two ways: flamingos and flamingoes... Just like 'go' and 'goes'
Vert is the masculine form. Verte is feminine, and vertes is plural.
A single scarf is simply spelled scarf. The plural form is scarves.
singular form = ox, plural = oxen singular form = man, plural = men single = child, plural = children single = woman, plural = women
The plural form of "axe" is "axes."
The plural form of the noun company is spelled companies.
The plural of "bus" is "buses."
The plural form of Jones is spelled "Joneses".
The plural form of "halo" is spelled "halos."
The plural form of donkey is spelled as "donkeys."
No, crisis is the singular form; the plural form is crises.
The plural form of "philosophy" is spelled "philosophies."
Normal words do not form plurals with apostrophes. The plural is spelled "advantages" and the adjective is "advantageous".
The noun form for the number 40 is spelled forty. The plural form is forties.