I am currently studying 日本語 and I am trying to understand the pronunciation difference between 桃 (peach) and 腿 (thigh). Both can be written as もも in kana and sound practically the same to me when my tutor pronounces them to me, but she tells me that there is a difference in terms of the pronunciation, though I can't figure out what it is and thus how to say them properly.
So what is the difference in pronunciation? Is it stress? Accent? And how do I pronounce them so that a 日本人 can tell which one of them it is that I mean?