excelsior vs wood shavings

excelsior and wood shavings both are nouns.

Word	Noun	Adjective	Verb	Adverb
excelsior	Yes	No	No	No
wood shavings	Yes	No	No	No

As nouns, excelsior and wood shavings are synonyms defined as:

excelsior and wood shavings: thin curly wood shavings used for packing or stuffing

excelsior (noun)	wood shavings (noun)
thin curly wood shavings used for packing or stuffing	thin curly wood shavings used for packing or stuffing