sheath pile vs sheet pile

sheath pile and sheet pile both are nouns.

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

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

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

Other synonyms of sheath pile include sheet piling.

sheath pile (noun)	sheet 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