Cling/clench
Drink/drench
Wring/wrench
Stink/stench
(Actually, only two of those latter words are causatives, and wring/wrench is much more distantly related than the others, but I still like the pairs. Now all we need is a new word "thinch" to match think and round it out.)
Drink/drench
Wring/wrench
Stink/stench
(Actually, only two of those latter words are causatives, and wring/wrench is much more distantly related than the others, but I still like the pairs. Now all we need is a new word "thinch" to match think and round it out.)