sheath pile vs sheet piling

sheath pile and sheet piling both are nouns.

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

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

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

Other synonyms of sheath pile include sheet pile.

sheath 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