Just the plural form of the word "eight"? It would be "eights", but I'm not entirely sure that's what you meant.
Trays is the plural of tray.
loaves is a plural noun in the rule 8
eights, 8s
8s or eights.
If using number then 8's.If using words then eights.
One eight, two eights.
An octagon has 8 vertices which is the plural of vertex
In the KJV not in singular form. But it is mentioned three times in the plural. These are in Revelation 5:8, 8:3 and 8:4.
Lbs-plural.
A cube for example has 12 edges, 6 faces and 8 vertices which is the plural of vertex
Singular ; this and that Plural ; these and those
56 Pennies equals 56 Pence. Pence is the plural of Penny.