minor expense vs expense

minor expense and expense both are nouns.

Word	Noun	Adjective	Verb	Adverb
minor expense	Yes	No	No	No
expense	Yes	No	Yes	No

As nouns, expense is a hypernym of minor expense; that is, expense is a word with a broader meaning than minor expense:

minor expense (noun)	expense (noun)
(frequently plural) an expense not budgeted or not specified	a detriment or sacrifice
	amounts paid for goods and services that may be currently tax deductible (as opposed to capital expenditures)
	money spent to perform work and usually reimbursed by an employer

minor expense (verb)	expense (verb)
	reduce the estimated value of something