sheet piling vs sheath pile

sheet piling and sheath pile both are nouns.

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

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

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

Other synonyms of sheet piling include sheet pile.

sheet piling (noun)	sheath pile (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