Quatrefoil is a coordinate term of huitfoil.
In architecture|lang=en terms the difference between quatrefoil and huitfoil
is that
quatrefoil is (architecture) a symmetrical shape that forms the overall outline of four partially-overlapping circles of the same diameter while
huitfoil is (architecture) a symmetrical shape which forms the overall outline of eight partially-overlapping circles of the same diameter.
In heraldiccharge|lang=en terms the difference between quatrefoil and huitfoil
is that
quatrefoil is (heraldiccharge) a stylized flower or leaf with four lobes while
huitfoil is (heraldiccharge) a stylized flower or leaf with eight lobes; an octofoil.
As nouns the difference between quatrefoil and huitfoil
is that
quatrefoil is (architecture) a symmetrical shape that forms the overall outline of four partially-overlapping circles of the same diameter while
huitfoil is (architecture) a symmetrical shape which forms the overall outline of eight partially-overlapping circles of the same diameter.