business expense vs trade expense

business expense and trade expense both are nouns.

Word	Noun	Adjective	Verb	Adverb
business expense	Yes	No	No	No
trade expense	Yes	No	No	No

As nouns, business expense and trade expense are synonyms defined as:

business expense and trade expense: ordinary and necessary expenses incurred in a taxpayer's business or trade

business expense (noun)	trade expense (noun)
ordinary and necessary expenses incurred in a taxpayer's business or trade	ordinary and necessary expenses incurred in a taxpayer's business or trade