foil vs aluminium foil

foil and aluminium foil both are nouns.

Word	Noun	Adjective	Verb	Adverb
foil	Yes	No	Yes	No
aluminium foil	Yes	No	No	No

As nouns, aluminium foil is a hyponym of foil; that is, aluminium foil is a word with a more specific, narrower meaning than foil:

Other hyponyms of foil include aluminum foil, tin foil, chaff, gold foil, tin foil, tinfoil.

foil (noun)	aluminium foil (noun)
a light slender flexible sword tipped by a button	foil made of aluminum
a piece of thin and flexible sheet metal
picture consisting of a positive photograph or drawing on a transparent base; viewed with a projector
a device consisting of a flat or curved piece (as a metal plate) so that its surface reacts to the water it is passing through
anything that serves by contrast to call attention to another thing's good qualities

foil (verb)	aluminium foil (verb)
cover or back with foil
hinder or prevent (the efforts, plans, or desires) of
enhance by contrast