Here is an example The Royal Canadian Mounties ride on their mounts. If you could not differentiate you would not know who or what is riding what or who. The Royal Canadian mounts ride on their mounts would not work.
Most nouns add an "s". (This is what's really happening in the example above. The singular is Mountie.) Nouns that end in "s", "x" and "z" add "es". (But words that end in "us" drop the "us" and change to "i" like cactus>cacti.) Nouns that end in "y" change the "y" to an "i" and add "es". Some nouns have a totally different pluralization: mouse>mice, ox>oxen, datum>data. Some words borrowed from other languages use "i" for pluralization.
Some plural nouns that end with 'os' are:avocadosbanjosbarriosbongosechosegosflamingosghettosgigoloshaloshobosJellokangaroolassologosnachospatiosphotospianospiccolosradiosrhinossolosstudiostacostattoostriosvideoszeroszoos
Some words that end in -s that are always plural are:accommodationsamendsarchivesbarracksbinocularsbowelsclothescommunicationscongratulationscontentscrossroadsforcepsgallowsglasses (vision aid)goodsheadquartersjeansmathematicsmeansnewspajamaspantsscissorsseriesshortsspeciesstairstongstrouserstweezers
Some words end in -fe, e.g knife (that is in singular) but when you turn it to a plural you write knives.
Most plural words do.
The plural of "borrador" in Spanish is "borradores."
what are the greek words end by 'on' in singular and change to 'a' in plural?
These words end in O and make the plural by adding ES. buffalo buffaloes domino dominoes echo echoes embargo embargoes hero heroes mosquito mosquitoes potato potatoes tomato tomatoes torpedo torpedoes veto vetoes
Two plural words ending in '-s':table > tableschair > chairs
bananas! boss bass blows bands bakes bans bits And loads of others... can't think of any non-plural off the top of my head...
Some plural words that end in "f" include wolves, dwarves, and cliffs.
"Children", "Women" and "Fish" are plural words that do not end with an 's'. There are many more.
Nouns ending in 'y' that form the plural by adding 's' to the end of the word are those that have a vowel preceding the 'y'. Examples:turkey - turkeysmonkey - monkeysdonkey - donkeysway - waysboy - boysvalley - valleysjockey - jockeysplay - playskey - keystoy - toys