Beth

Cath

Goth

hath

kith

math

meth

moth

pith

Seth

Sith

thatch

thick

thin

thud

thug

with

broth

cloth

fifth

filth

plinth

sixth

tenth

thank

thing

think

thrash

thresh

thrift

thrill

thrip

throb

throng

thrum

thrush

twelfth

bath

booth

both

breath

earth

length

month

mouth

ninth

north

oath

path

south

strength

teeth

thaw

thief

thigh

third

thorn

thread

three

thumb

tooth

wreath

youth

anthem

anything

apathy

athlete

bathrobe

bathtub

beneath

birthday

earthy

empathy

everything

filthy

frothy

healthy

lengthy

marathon

nothing

panther

pathway

pithy

plaything

python

seventh

something

stealthy

strength

telepathy

theatre (UK)

theater (US)

therapy

thermometer

thermos

thimble

thirsty

thirteen

thirty

thoughtful

thousand

thunder

Thursday

toothache

toothbrush

toothpaste

toothpick

truthful

wealthy