travel expense vs plural form

travel expense and plural form both are nouns.

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

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