unexpended vs left over

unexpended and left over both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unexpended	No	Yes	No	No
left over	No	Yes	No	No

As adjectives, unexpended and left over are synonyms defined as:

Other synonyms of unexpended include left, leftover, odd, remaining.

unexpended (adjective)	left over (adjective)
not used up	not used up
(of financial resources) not spent