This one is a bit of a pain... and I could add even more subset words. In fact, this one brings us full circle, because a lot of Americans actually say most of these words as NURSE words.
I do go into depth on this sound, and dive fully into Generican (Generic American) materials at https://www.accenthelp.com/products/g...

#IPA #accenthelp #TOUR #CURE #poorpour #generalamerican #accents #lexicalsets