sheet pile vs sheet piling

sheet pile and sheet piling both are nouns.

Word	Noun	Adjective	Verb	Adverb
sheet pile	Yes	No	No	No
sheet piling	Yes	No	No	No

As nouns, sheet pile and sheet piling are synonyms defined as:

sheet pile and sheet piling: a pile in a row of piles driven side by side to retain earth or prevent seepage

Other synonyms of sheet pile include sheath pile.

sheet pile (noun)	sheet piling (noun)
a pile in a row of piles driven side by side to retain earth or prevent seepage	a pile in a row of piles driven side by side to retain earth or prevent seepage