cupfuls
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Cupful is singular; cupfuls is the plural.
The plural form of cupful is cupfuls.
In the word cupful, cup is the root, and ful is the suffix.
Both "cupful" and the plural "cupfuls" use only one L, a common short form used in measurements (teaspoonful, etc.).
No, the noun cupful is a concrete noun; a word for an amount of a substance; a word for a physical measurement.