sheet pile vs sheath pile

sheet pile and sheath pile both are nouns.

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

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

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

Other synonyms of sheet pile include sheet piling.

sheet pile (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