In each of the following word pairs the second word is a synonym of the first. Can you identify another characteristic that the second has to the first?

bright limpid
good   commendable
lass   damsel
old    wizened
out    banish
small  negligible

The characteristic similarity is with "Kangaroo words". 

Googling "Kangaroo words" should provide links that would give its definintion to those who can not decipher it from the following list of some of those words:

aberrant, abide, acrid, action, affect, allocate, amicable,
appropriate, asseverate, astound, banish, barricade, before, canister, catacomb, encourage, hostelry, instructor, observe, recline, salvage, separate, transgression, and unsightly.