Petiole and Stem

Petiole noun - The slender stem that supports the blade of a leaf.

Stem and petiole are semantically related In some cases you can use "Stem" instead a noun "Petiole".

Stem noun - Cylinder forming a long narrow part of something.

Petiole and stem are semantically related in bine topic. You can use "Petiole" instead a noun "Stem", if it concerns topics such as technical, stalk of plant.