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100

building

buildings

100
essay

essays

100

river

rivers

100

student

students

100
desk

desks

200

beach

beaches

200

class

classes

200
volcano

volcanoes

200

actress

actresses

200

watch

watches

300

country

countries

300

library

libraries

300

butterfly

butterflies

300
secretary
secretaries
300

hobby

hobbies
400

life

lives

400

bookshelf

bookshelves

400

wolf

wolves

400

thief

thieves

400

knife

knives

500

oasis

oases

500

child

chidren

500

fish

fish

500

chairman

chairmen

500

mouse 

mice