meal ticket vs luncheon voucher

meal ticket and luncheon voucher both are nouns.

Word	Noun	Adjective	Verb	Adverb
meal ticket	Yes	No	No	No
luncheon voucher	Yes	No	No	No

As nouns, meal ticket and luncheon voucher are synonyms defined as:

meal ticket and luncheon voucher: coupon redeemable at a restaurant and entitling the holder to a meal

meal ticket (noun)	luncheon voucher (noun)
coupon redeemable at a restaurant and entitling the holder to a meal	coupon redeemable at a restaurant and entitling the holder to a meal
a source of income or livelihood