plural form vs travel expense

plural form and travel expense both are nouns.

Word	Noun	Adjective	Verb	Adverb
plural form	Yes	No	No	No
travel expense	Yes	No	No	No

plural form (noun)	travel expense (noun)
the form of a word that is used to denote more than one	(frequently plural) expenses incurred by an employee in the performance of the job and usually reimbursed by the employer