Synecdoche ("sin-EK-doh-kee") is the rhetorical or metaphorical substitution of a part for the whole, or vice versa.
Examples: when you refer to workers as “hands,” you allow a part (the hand) to stand in for the whole (the person). Ditto in counting cattle as “heads.”
Note: This guide is still in the early stages of development.
Three question marks mean I have to write more on the subject. Bear with me.