handles — a part of a thing made specifically to be grasped or held by the hand.
stocks — a supply of goods kept on hand for sale to customers by a merchant, distributor, manufacturer, etc.; inventory.
stumps — the lower end of a tree or plant left after the main part falls or is cut off; a standing tree trunk from which the upper part and branches have been removed.
knobs — a projecting part, usually rounded, forming the handle of a door, drawer, or the like.
stems — science, technology, engineering, and mathematics, considered as a group of academic or career fields (often used attributively): degree programs in STEM disciplines; teaching STEM in high school.