the use of the word "luck" or "fortune" in any way
"bless you" or "geshundheit" (as in post-sneeze)
any euphemism relating to god or jesus - such as "gee whiz", "geeze", "oh my god", "jeepers creepers", "good god", "good lord", "lordie", "cripes", etc etc......
then there was a time when it was okay to refer to worldlings as "goats" but then it changed when they decided that the sheep and the goats wouldn't be separated until a later time....plus you might view a potential witness as a goat and then find out they'd be a sheep and that would be wrooong.
then the changes.....they had colporteurs, but then they had to be called pioneers. you had company servants but then they had to be called congregation servants....and then they had to be called elders....and then there was a presiding overseer, but then he couldn't be called that he became a coordinator (i think - last i knew it was the PO) and then the circuit servant became a circuit overseer....and a back call became a return visit and incidental witnessing became informal witnessing somewhere along the line - and if you didn't keep up with the lingo you were labelled weak....not keeping up with that chariot.