I created this plural nouns word search puzzle when I was in a long term sub assignment for 3rd grade. I have also used it with 4th graders. The children are asked to write the plural form of each noun and to then find the plural form of the nouns in the word search.
Below are links to some of my other items that might interest you. Thanks for looking!
Months of the Year Word Search Puzzles / Monthly Vocabulary / 3rd Grade
Identifying Parts of Speech / Reading Activity / Weekly Story or Chapter Books
Spelling Word Definitions Worksheet