Nouns ending in "s":
* Singular:
* bus, kiss, class, boss, loss, mess, fuss, news, gas, dress, grass
* Plural:
* cats, dogs, birds, books, chairs, boxes, houses, trees, toys, shoes
Nouns ending in "x":
* Singular:
* box, fox, tax, fix, wax, mix, flex, sex, annex
* Plural:
* boxes, foxes, taxes, fixes, waxes, mixes, flexes, annexes
Nouns ending in "z":
* Singular:
* buzz, quiz, whiz, fizz, fuzz, topaz, waltz
* Plural:
* buzzes, quizzes, whizzes, fizzes, fuzzes, topazes, waltzes
Nouns ending in "ch":
* Singular:
* beach, breach, coach, ditch, lunch, match, peach, search, speech, stitch, watch
* Plural:
* beaches, breaches, coaches, ditches, lunches, matches, peaches, searches, speeches, stitches, watches
Nouns ending in "ss":
* Singular:
* bass, boss, cross, dress, guess, hiss, kiss, miss, press, stress, success
* Plural:
* basses, bosses, crosses, dresses, guesses, hisses, kisses, misses, presses, stresses, successes
Nouns ending in "sh":
* Singular:
* crash, dash, flash, hush, lash, mesh, push, rush, sash, splash, trash
* Plural:
* crashes, dashes, flashes, hushes, lashes, meshes, pushes, rushes, sashes, splashes, trashes
This is just a small sample. There are many more nouns that end in these letters!