I remember that faggots were small sticks of wood to be burnt in a stove in the western States. That was a long time ago and I doubt that young people would know that meaning.
Both zucchini and courgette appeared in the OED for the first time in 1987, but they date to about 1930 in English. Zucchini is used in Australia as well as in the USA and Canada.
Sidewalk as a paved walk at the side of a street came into usage in the early 18th C. in England, spread to America, and became obsolete in England where pavement "rules" (an English usage that has spread to America).