People
* Man
* Girl
* Boy
* King
* Queen
* Chef
* Maid
Animals
* Cat
* Dog
* Bird
* Fish
* Horse
* Bear
* Fox
Objects
* Chair
* Book
* Door
* Wall
* Table
* Lamp
* Shoe
* Box
* Pen
* Key
* Car
* Boat
Places
* Town
* Room
* Park
* Home
* Field
* Road
* Beach
Concepts
* Love
* Hate
* Fear
* Hope
* Time
* Life
* Death
* Pain
* Joy
* Truth
Nature
* Sun
* Moon
* Rain
* Snow
* Wind
* Tree
* Rock
* Hill
This is just a small sample, and there are many more one-syllable nouns in the English language. You can expand this list by thinking about different categories and specific words within those categories.
Remember that some words can be both nouns and verbs, and sometimes they change their syllable count depending on their function in a sentence. For example, "play" is a one-syllable noun but a two-syllable verb ("to play").