Minimal Pairs

/θ/ (voiceless dental fricative)   –   /s/ (voiceless alveolar fricative)
thinsin
thicksick
thoughtsort
themeseem
thongsong
thighsigh
thornsawn
thumbsome
thudsud
Perthpurse
faithface
kithkiss
northNorse
worthworse
mouthmouse
fourthforce
pathpass
pithpiss
growthgross
youthuse (noun)