oo (look)
oo (moon)
ew
er sound
high frequency
100

book

book

100

zoo

zoo

100

new

new

100

her

her

100

ready

ready

200

wood

wood

200

too

too

200

few

few

200

bird

bird

200

soil

soil

300

shook

shook

300

noon

noon

300

blew

blew

300

turn

turn

300

kinds

kinds

400

brook

brook

400

zoom

zoom

400

grew

grew

400

third

third

400

almost

almost

500

cookbook

cookbook

500

scoop

scoop

500

flew

flew

500

first

first

500

country

country