There are no words in the English language that begin with the letter "i" and end with the letter j.
java
juice
abjectadjectiveadjournadjustdejecteddisjointeddoorjambdrudgejadejudgejaundice
No word in the English language begins with U and ends with J.
Quij
justunfuf
Jump is shouted. It begins with the letter j.
Janitor is a sanitation word. It begins with the letter j.
4 words that fit the pattern are jilt, jolt, jest, and just.
jackknifejackstoneJacobitejadejakejanejanglejapejejunejibejinglejinneejivejokejudgejuiceju-jitsueju-jujujubejulienneJunejumglejutejuvenilejuvenillajuxtapose
Well there's " junk "
A four letter word that starts with J and ends with M: jism.