Several years ago there was a korean English video that went viral whereby the teacher was trying to say "I like coke (코)" but instead kept saying "I like cock(erel) (커)" I dont have an audio sorry but the principle is there - for nose, make the co (coke) sound 코. And for coffee, go for the cock(erel) sound 커 Sorry i had to write cock(erel), apparently the british word for rooster is too disgusting to submit!!!