'Groan' is more in the throat; 'moan' more in the mouth and head. Think of a tree in high wind: The heavy, wooden trunk of the tree might groan - it's more of a rough, creaking sound. Here's a recording of someone groaning ( and grunting): https://www.youtube.com/watch?v=p_PIwyCGQ9o The wind in the branches might make a low, moaning sound. I did want to post a sound file of a person moaning, but they all seemed to be pornographic. But...um..maybe that gives you some idea? ;)

"moan" denotes some kind of derived pleasure whereas "groan" does not. The whispering moans of chocolate first entering the mouth. The beams groan under the weight of the heavy roof. When you like to know the difference in meaning between two words, it is best to do a google search by typing "X vs Y".

thank you, Dayna.

A groan is more commonly used for physical exertion or a noise of complaint or frustration. For example: She groaned as she pushed the table across the roam. The kids all groaned when the teacher told them they would have homework. Moan is used more for physical sensation and it can be pain or pleasure. Be careful with this as it can have sexual connotations. Example: She was rolling around, moaning in pain.